Don't throw checked exceptions from Assert classes

Fixes gh-5709

spring-boot-test/src/main/java/org/springframework/boot/test/json/BasicJsonTester.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.test.json;
 
 import java.io.File;
-import java.io.IOException;
 import java.io.InputStream;
 
 import org.springframework.core.io.Resource;
@@ -63,9 +62,9 @@ public class BasicJsonTester {
 	 * using {@code resourceLoadClass}.
 	 * @param source JSON content or a {@code .json} resource name
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(CharSequence source) throws IOException {
+	public JsonContent<Object> from(CharSequence source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -74,10 +73,9 @@ public class BasicJsonTester {
 	 * @param path the path of the resource to load
 	 * @param resourceLoadClass the classloader used load the resource
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(String path, Class<?> resourceLoadClass)
-			throws IOException {
+	public JsonContent<Object> from(String path, Class<?> resourceLoadClass) {
 		return getJsonContent(this.loader.getJson(path, resourceLoadClass));
 	}
 
@@ -85,9 +83,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON bytes.
 	 * @param source the bytes of JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(byte[] source) throws IOException {
+	public JsonContent<Object> from(byte[] source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -95,9 +93,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON file.
 	 * @param source the file containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(File source) throws IOException {
+	public JsonContent<Object> from(File source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -105,9 +103,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON input stream.
 	 * @param source the input stream containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(InputStream source) throws IOException {
+	public JsonContent<Object> from(InputStream source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 
@@ -115,9 +113,9 @@ public class BasicJsonTester {
 	 * Create JSON content from the specified JSON resource.
 	 * @param source the resource containing JSON
 	 * @return the JSON content
-	 * @throws IOException on load error
+	 * @on load error
 	 */
-	public JsonContent<Object> from(Resource source) throws IOException {
+	public JsonContent<Object> from(Resource source) {
 		return getJsonContent(this.loader.getJson(source));
 	}
 

spring-boot-test/src/main/java/org/springframework/boot/test/json/JsonContentAssert.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.test.json;
 
 import java.io.File;
-import java.io.IOException;
 import java.io.InputStream;
 import java.util.List;
 import java.util.Map;
@@ -67,28 +66,22 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 */
 	@Override
 	public JsonContentAssert isEqualTo(Object expected) {
-		try {
-			if (expected == null || expected instanceof CharSequence) {
-				return isEqualToJson((CharSequence) expected);
-			}
-			if (expected instanceof byte[]) {
-				return isEqualToJson((byte[]) expected);
-			}
-			if (expected instanceof File) {
-				return isEqualToJson((File) expected);
-			}
-			if (expected instanceof InputStream) {
-				return isEqualToJson((InputStream) expected);
-			}
-			if (expected instanceof Resource) {
-				return isEqualToJson((Resource) expected);
-			}
-			throw new AssertionError(
-					"Unsupport type for JSON assert " + expected.getClass());
+		if (expected == null || expected instanceof CharSequence) {
+			return isEqualToJson((CharSequence) expected);
 		}
-		catch (IOException ex) {
-			throw new IllegalStateException(ex);
+		if (expected instanceof byte[]) {
+			return isEqualToJson((byte[]) expected);
 		}
+		if (expected instanceof File) {
+			return isEqualToJson((File) expected);
+		}
+		if (expected instanceof InputStream) {
+			return isEqualToJson((InputStream) expected);
+		}
+		if (expected instanceof Resource) {
+			return isEqualToJson((Resource) expected);
+		}
+		throw new AssertionError("Unsupport type for JSON assert " + expected.getClass());
 	}
 
 	/**
@@ -99,10 +92,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON or the name of a resource containing the expected
 	 * JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(CharSequence expected) throws IOException {
+	public JsonContentAssert isEqualToJson(CharSequence expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -113,11 +106,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param path the name of a resource containing the expected JSON
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(String path, Class<?> resourceLoadClass)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(String path, Class<?> resourceLoadClass) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -127,10 +119,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON bytes.
 	 * @param expected the expected JSON bytes
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(byte[] expected) throws IOException {
+	public JsonContentAssert isEqualToJson(byte[] expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -140,10 +132,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON file.
 	 * @param expected a file containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(File expected) throws IOException {
+	public JsonContentAssert isEqualToJson(File expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -153,10 +145,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON input stream.
 	 * @param expected an input stream containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(InputStream expected) throws IOException {
+	public JsonContentAssert isEqualToJson(InputStream expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -166,10 +158,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON resource.
 	 * @param expected a resource containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(Resource expected) throws IOException {
+	public JsonContentAssert isEqualToJson(Resource expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -182,11 +174,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON or the name of a resource containing the expected
 	 * JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isStrictlyEqualToJson(CharSequence expected)
-			throws IOException {
+	public JsonContentAssert isStrictlyEqualToJson(CharSequence expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -197,11 +188,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param path the name of a resource containing the expected JSON
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isStrictlyEqualToJson(String path,
-			Class<?> resourceLoadClass) throws IOException {
+			Class<?> resourceLoadClass) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -211,10 +202,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * the specified JSON bytes.
 	 * @param expected the expected JSON bytes
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isStrictlyEqualToJson(byte[] expected) throws IOException {
+	public JsonContentAssert isStrictlyEqualToJson(byte[] expected) {
 		return assertNotFailed(
 				compare(this.loader.getJson(expected), JSONCompareMode.STRICT));
 	}
@@ -224,10 +215,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * the specified JSON file.
 	 * @param expected a file containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isStrictlyEqualToJson(File expected) throws IOException {
+	public JsonContentAssert isStrictlyEqualToJson(File expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -237,11 +228,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * the specified JSON input stream.
 	 * @param expected an input stream containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isStrictlyEqualToJson(InputStream expected)
-			throws IOException {
+	public JsonContentAssert isStrictlyEqualToJson(InputStream expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -251,10 +241,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * the specified JSON resource.
 	 * @param expected a resource containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isStrictlyEqualToJson(Resource expected) throws IOException {
+	public JsonContentAssert isStrictlyEqualToJson(Resource expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -267,11 +257,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(CharSequence expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, compareMode));
 	}
@@ -282,11 +272,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(String path, Class<?> resourceLoadClass,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotFailed(compare(expectedJson, compareMode));
 	}
@@ -296,11 +286,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON bytes
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(byte[] expected, JSONCompareMode compareMode)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(byte[] expected, JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, compareMode));
 	}
@@ -310,11 +299,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a file containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(File expected, JSONCompareMode compareMode)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(File expected, JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, compareMode));
 	}
@@ -324,11 +312,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected an input stream containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(InputStream expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		return assertNotFailed(compare(this.loader.getJson(expected), compareMode));
 	}
 
@@ -337,11 +325,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a resource containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(Resource expected, JSONCompareMode compareMode)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(Resource expected,
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, compareMode));
 	}
@@ -354,11 +342,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(CharSequence expected,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -369,11 +357,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(String path, Class<?> resourceLoadClass,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -383,11 +371,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON bytes
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(byte[] expected, JSONComparator comparator)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(byte[] expected, JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -397,11 +384,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a file containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(File expected, JSONComparator comparator)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(File expected, JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -411,11 +397,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected an input stream containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
 	public JsonContentAssert isEqualToJson(InputStream expected,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -425,11 +411,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a resource containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is not equal to the given one
 	 */
-	public JsonContentAssert isEqualToJson(Resource expected, JSONComparator comparator)
-			throws IOException {
+	public JsonContentAssert isEqualToJson(Resource expected, JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotFailed(compare(expectedJson, comparator));
 	}
@@ -441,28 +426,22 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 */
 	@Override
 	public JsonContentAssert isNotEqualTo(Object expected) {
-		try {
-			if (expected == null || expected instanceof CharSequence) {
-				return isNotEqualToJson((CharSequence) expected);
-			}
-			if (expected instanceof byte[]) {
-				return isNotEqualToJson((byte[]) expected);
-			}
-			if (expected instanceof File) {
-				return isNotEqualToJson((File) expected);
-			}
-			if (expected instanceof InputStream) {
-				return isNotEqualToJson((InputStream) expected);
-			}
-			if (expected instanceof Resource) {
-				return isNotEqualToJson((Resource) expected);
-			}
-			throw new AssertionError(
-					"Unsupport type for JSON assert " + expected.getClass());
+		if (expected == null || expected instanceof CharSequence) {
+			return isNotEqualToJson((CharSequence) expected);
+		}
+		if (expected instanceof byte[]) {
+			return isNotEqualToJson((byte[]) expected);
+		}
+		if (expected instanceof File) {
+			return isNotEqualToJson((File) expected);
+		}
+		if (expected instanceof InputStream) {
+			return isNotEqualToJson((InputStream) expected);
 		}
-		catch (IOException ex) {
-			throw new IllegalStateException(ex);
+		if (expected instanceof Resource) {
+			return isNotEqualToJson((Resource) expected);
 		}
+		throw new AssertionError("Unsupport type for JSON assert " + expected.getClass());
 	}
 
 	/**
@@ -473,10 +452,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON or the name of a resource containing the expected
 	 * JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(CharSequence expected) throws IOException {
+	public JsonContentAssert isNotEqualToJson(CharSequence expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -487,11 +466,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param path the name of a resource containing the expected JSON
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(String path, Class<?> resourceLoadClass)
-			throws IOException {
+	public JsonContentAssert isNotEqualToJson(String path, Class<?> resourceLoadClass) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -501,10 +479,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * equal to the specified JSON bytes.
 	 * @param expected the expected JSON bytes
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(byte[] expected) throws IOException {
+	public JsonContentAssert isNotEqualToJson(byte[] expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -514,10 +492,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * equal to the specified JSON file.
 	 * @param expected a file containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(File expected) throws IOException {
+	public JsonContentAssert isNotEqualToJson(File expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -527,10 +505,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * equal to the specified JSON input stream.
 	 * @param expected an input stream containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(InputStream expected) throws IOException {
+	public JsonContentAssert isNotEqualToJson(InputStream expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.LENIENT));
 	}
@@ -540,10 +518,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * equal to the specified JSON resource.
 	 * @param expected a resource containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(Resource expected) throws IOException {
+	public JsonContentAssert isNotEqualToJson(Resource expected) {
 		return assertNotPassed(
 				compare(this.loader.getJson(expected), JSONCompareMode.LENIENT));
 	}
@@ -556,11 +534,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON or the name of a resource containing the expected
 	 * JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotStrictlyEqualToJson(CharSequence expected)
-			throws IOException {
+	public JsonContentAssert isNotStrictlyEqualToJson(CharSequence expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -571,11 +548,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param path the name of a resource containing the expected JSON
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotStrictlyEqualToJson(String path,
-			Class<?> resourceLoadClass) throws IOException {
+			Class<?> resourceLoadClass) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -585,11 +562,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON bytes.
 	 * @param expected the expected JSON bytes
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotStrictlyEqualToJson(byte[] expected)
-			throws IOException {
+	public JsonContentAssert isNotStrictlyEqualToJson(byte[] expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -599,10 +575,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON file.
 	 * @param expected a file containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotStrictlyEqualToJson(File expected) throws IOException {
+	public JsonContentAssert isNotStrictlyEqualToJson(File expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -612,11 +588,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON input stream.
 	 * @param expected an input stream containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotStrictlyEqualToJson(InputStream expected)
-			throws IOException {
+	public JsonContentAssert isNotStrictlyEqualToJson(InputStream expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -626,11 +601,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * to the specified JSON resource.
 	 * @param expected a resource containing the expected JSON
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotStrictlyEqualToJson(Resource expected)
-			throws IOException {
+	public JsonContentAssert isNotStrictlyEqualToJson(Resource expected) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, JSONCompareMode.STRICT));
 	}
@@ -643,11 +617,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(CharSequence expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -658,11 +632,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(String path, Class<?> resourceLoadClass,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -672,11 +646,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON bytes
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(byte[] expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -686,11 +660,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a file containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(File expected, JSONCompareMode compareMode)
-			throws IOException {
+	public JsonContentAssert isNotEqualToJson(File expected,
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -700,11 +674,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected an input stream containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(InputStream expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -714,11 +688,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a resource containing the expected JSON
 	 * @param compareMode the compare mode used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(Resource expected,
-			JSONCompareMode compareMode) throws IOException {
+			JSONCompareMode compareMode) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, compareMode));
 	}
@@ -731,11 +705,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(CharSequence expected,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}
@@ -746,11 +720,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param resourceLoadClass the source class used to load the resource
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(String path, Class<?> resourceLoadClass,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(path, resourceLoadClass);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}
@@ -760,11 +734,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected the expected JSON bytes
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(byte[] expected, JSONComparator comparator)
-			throws IOException {
+	public JsonContentAssert isNotEqualToJson(byte[] expected,
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}
@@ -774,11 +748,10 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a file containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
-	public JsonContentAssert isNotEqualToJson(File expected, JSONComparator comparator)
-			throws IOException {
+	public JsonContentAssert isNotEqualToJson(File expected, JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}
@@ -788,11 +761,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected an input stream containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(InputStream expected,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}
@@ -802,11 +775,11 @@ public class JsonContentAssert extends AbstractAssert<JsonContentAssert, CharSeq
 	 * @param expected a resource containing the expected JSON
 	 * @param comparator the comparator used when checking
 	 * @return {@code this} assertion object
-	 * @throws IOException on IO error
+	 * @on IO error
 	 * @throws AssertionError if the actual JSON value is equal to the given one
 	 */
 	public JsonContentAssert isNotEqualToJson(Resource expected,
-			JSONComparator comparator) throws IOException {
+			JSONComparator comparator) {
 		String expectedJson = this.loader.getJson(expected);
 		return assertNotPassed(compare(expectedJson, comparator));
 	}

spring-boot-test/src/main/java/org/springframework/boot/test/json/JsonLoader.java

@@ -44,7 +44,7 @@ class JsonLoader {
 		return this.resourceLoadClass;
 	}
 
-	public String getJson(CharSequence source) throws IOException {
+	public String getJson(CharSequence source) {
 		if (source == null) {
 			return null;
 		}
@@ -55,24 +55,39 @@ class JsonLoader {
 		return source.toString();
 	}
 
-	public String getJson(String path, Class<?> resourceLoadClass) throws IOException {
+	public String getJson(String path, Class<?> resourceLoadClass) {
 		return getJson(new ClassPathResource(path, resourceLoadClass));
 	}
 
-	public String getJson(byte[] source) throws IOException {
+	public String getJson(byte[] source) {
 		return getJson(new ByteArrayInputStream(source));
 	}
 
-	public String getJson(File source) throws IOException {
-		return getJson(new FileInputStream(source));
+	public String getJson(File source) {
+		try {
+			return getJson(new FileInputStream(source));
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from " + source, ex);
+		}
 	}
 
-	public String getJson(Resource source) throws IOException {
-		return getJson(source.getInputStream());
+	public String getJson(Resource source) {
+		try {
+			return getJson(source.getInputStream());
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from " + source, ex);
+		}
 	}
 
-	public String getJson(InputStream source) throws IOException {
-		return FileCopyUtils.copyToString(new InputStreamReader(source));
+	public String getJson(InputStream source) {
+		try {
+			return FileCopyUtils.copyToString(new InputStreamReader(source));
+		}
+		catch (IOException ex) {
+			throw new IllegalStateException("Unable to load JSON from InputStream", ex);
+		}
 	}
 
 }