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SEC-423: Fixed IllegalArguemntException being thrown by checking for null contextFromSessionObject

1.0.x
Vishal Puri 19 years ago
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af4479670e
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62c832e366
1 changed files with 354 additions and 300 deletions
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  1. 654
      core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java

654
core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java
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@ -33,323 +33,377 @@ import org.springframework.beans.factory.InitializingBean; @@ -33,323 +33,377 @@ import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import org.springframework.util.ReflectionUtils;
/**
* Populates the {@link SecurityContextHolder} with information obtained from the <code>HttpSession</code>.
*
* Populates the {@link SecurityContextHolder} with information obtained from
* the <code>HttpSession</code>.
*
* <p>
* The <code>HttpSession</code> will be queried to retrieve the <code>SecurityContext</code> that should be
* stored against the <code>SecurityContextHolder</code> for the duration of the web request. At the end of the web
* request, any updates made to the <code>SecurityContextHolder</code> will be persisted back to the
* The <code>HttpSession</code> will be queried to retrieve the
* <code>SecurityContext</code> that should be stored against the
* <code>SecurityContextHolder</code> for the duration of the web request. At
* the end of the web request, any updates made to the
* <code>SecurityContextHolder</code> will be persisted back to the
* <code>HttpSession</code> by this filter.
* </p>
* <p>
* If a valid <code>SecurityContext</code> cannot be obtained from the <code>HttpSession</code> for whatever
* reason, a fresh <code>SecurityContext</code> will be created and used instead. The created object will be of the
* instance defined by the {@link #setContext(Class)} method (which defaults to {@link
* If a valid <code>SecurityContext</code> cannot be obtained from the
* <code>HttpSession</code> for whatever reason, a fresh
* <code>SecurityContext</code> will be created and used instead. The created
* object will be of the instance defined by the {@link #setContext(Class)}
* method (which defaults to {@link
* org.acegisecurity.context.SecurityContextImpl}.
* </p>
* <p>
* No <code>HttpSession</code> will be created by this filter if one does not already exist. If at the end of
* the web request the <code>HttpSession</code> does not exist, a <code>HttpSession</code> will <b>only</b> be created
* if the current contents of the <code>SecurityContextHolder</code> are not {@link
* java.lang.Object#equals(java.lang.Object)} to a <code>new</code> instance of {@link #setContext(Class)}. This
* avoids needless <code>HttpSession</code> creation, but automates the storage of changes made to the
* <code>SecurityContextHolder</code>. There is one exception to this rule, that is if the {@link
* #forceEagerSessionCreation} property is <code>true</code>, in which case sessions will always be created
* irrespective of normal session-minimisation logic (the default is <code>false</code>, as this is resource intensive
* and not recommended).
* No <code>HttpSession</code> will be created by this filter if one does not
* already exist. If at the end of the web request the <code>HttpSession</code>
* does not exist, a <code>HttpSession</code> will <b>only</b> be created if
* the current contents of the <code>SecurityContextHolder</code> are not
* {@link java.lang.Object#equals(java.lang.Object)} to a <code>new</code>
* instance of {@link #setContext(Class)}. This avoids needless
* <code>HttpSession</code> creation, but automates the storage of changes
* made to the <code>SecurityContextHolder</code>. There is one exception to
* this rule, that is if the {@link #forceEagerSessionCreation} property is
* <code>true</code>, in which case sessions will always be created
* irrespective of normal session-minimisation logic (the default is
* <code>false</code>, as this is resource intensive and not recommended).
* </p>
* <p>
* This filter will only execute once per request, to resolve servlet container (specifically Weblogic)
* incompatibilities.</p>
* This filter will only execute once per request, to resolve servlet container
* (specifically Weblogic) incompatibilities.
* </p>
* <p>
* If for whatever reason no <code>HttpSession</code> should <b>ever</b> be created (eg this filter is only
* being used with Basic authentication or similar clients that will never present the same <code>jsessionid</code>
* etc), the {@link #setAllowSessionCreation(boolean)} should be set to <code>false</code>. Only do this if you really
* need to conserve server memory and ensure all classes using the <code>SecurityContextHolder</code> are designed to
* have no persistence of the <code>SecurityContext</code> between web requests. Please note that if {@link
* #forceEagerSessionCreation} is <code>true</code>, the <code>allowSessionCreation</code> must also be
* <code>true</code> (setting it to <code>false</code> will cause a startup time error).
* If for whatever reason no <code>HttpSession</code> should <b>ever</b> be
* created (eg this filter is only being used with Basic authentication or
* similar clients that will never present the same <code>jsessionid</code>
* etc), the {@link #setAllowSessionCreation(boolean)} should be set to
* <code>false</code>. Only do this if you really need to conserve server
* memory and ensure all classes using the <code>SecurityContextHolder</code>
* are designed to have no persistence of the <code>SecurityContext</code>
* between web requests. Please note that if {@link #forceEagerSessionCreation}
* is <code>true</code>, the <code>allowSessionCreation</code> must also be
* <code>true</code> (setting it to <code>false</code> will cause a startup
* time error).
* </p>
* <p>
* This filter MUST be executed BEFORE any authentication processing mechanisms. Authentication processing
* mechanisms (eg BASIC, CAS processing filters etc) expect the <code>SecurityContextHolder</code> to contain a valid
* This filter MUST be executed BEFORE any authentication processing mechanisms.
* Authentication processing mechanisms (eg BASIC, CAS processing filters etc)
* expect the <code>SecurityContextHolder</code> to contain a valid
* <code>SecurityContext</code> by the time they execute.
* </p>
*
*
* @author Ben Alex
* @author Patrick Burleson
* @version $Id$
* @version $Id: HttpSessionContextIntegrationFilter.java 1784 2007-02-24
* 21:00:24Z luke_t $
*/
public class HttpSessionContextIntegrationFilter implements InitializingBean, Filter {
//~ Static fields/initializers =====================================================================================
protected static final Log logger = LogFactory.getLog(HttpSessionContextIntegrationFilter.class);
private static final String FILTER_APPLIED = "__acegi_session_integration_filter_applied";
public static final String ACEGI_SECURITY_CONTEXT_KEY = "ACEGI_SECURITY_CONTEXT";
//~ Instance fields ================================================================================================
private Class context = SecurityContextImpl.class;
private Object contextObject;
/**
* Indicates if this filter can create a <code>HttpSession</code> if needed (sessions are always created
* sparingly, but setting this value to <code>false</code> will prohibit sessions from ever being created).
* Defaults to <code>true</code>. Do not set to <code>false</code> if you are have set {@link
* #forceEagerSessionCreation} to <code>true</code>, as the properties would be in conflict.
*/
private boolean allowSessionCreation = true;
/**
* Indicates if this filter is required to create a <code>HttpSession</code> for every request before
* proceeding through the filter chain, even if the <code>HttpSession</code> would not ordinarily have been
* created. By default this is <code>false</code>, which is entirely appropriate for most circumstances as you do
* not want a <code>HttpSession</code> created unless the filter actually needs one. It is envisaged the main
* situation in which this property would be set to <code>true</code> is if using other filters that depend on a
* <code>HttpSession</code> already existing, such as those which need to obtain a session ID. This is only
* required in specialised cases, so leave it set to <code>false</code> unless you have an actual requirement and
* are conscious of the session creation overhead.
*/
private boolean forceEagerSessionCreation = false;
/**
* Indicates whether the <code>SecurityContext</code> will be cloned from the <code>HttpSession</code>. The
* default is to simply reference (ie the default is <code>false</code>). The default may cause issues if
* concurrent threads need to have a different security identity from other threads being concurrently processed
* that share the same <code>HttpSession</code>. In most normal environments this does not represent an issue,
* as changes to the security identity in one thread is allowed to affect the security identitiy in other
* threads associated with the same <code>HttpSession</code>. For unusual cases where this is not permitted,
* change this value to <code>true</code> and ensure the {@link #context} is set to a <code>SecurityContext</code>
* that implements {@link Cloneable} and overrides the <code>clone()</code> method.
*/
private boolean cloneFromHttpSession = false;
public boolean isCloneFromHttpSession() {
return cloneFromHttpSession;
}
public void setCloneFromHttpSession(boolean cloneFromHttpSession) {
this.cloneFromHttpSession = cloneFromHttpSession;
}
public HttpSessionContextIntegrationFilter() throws ServletException {
this.contextObject = generateNewContext();
}
//~ Methods ========================================================================================================
public void afterPropertiesSet() throws Exception {
if ((this.context == null) || (!SecurityContext.class.isAssignableFrom(this.context))) {
throw new IllegalArgumentException(
"context must be defined and implement SecurityContext "
+ "(typically use org.acegisecurity.context.SecurityContextImpl; existing class is "
+ this.context + ")");
}
if ((forceEagerSessionCreation == true) && (allowSessionCreation == false)) {
throw new IllegalArgumentException(
"If using forceEagerSessionCreation, you must set allowSessionCreation to also be true");
}
}
/**
* Does nothing. We use IoC container lifecycle services instead.
*/
public void destroy() {}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if ((request != null) && (request.getAttribute(FILTER_APPLIED) != null)) {
// ensure that filter is only applied once per request
chain.doFilter(request, response);
} else {
if (request != null) {
request.setAttribute(FILTER_APPLIED, Boolean.TRUE);
}
HttpSession httpSession = null;
boolean httpSessionExistedAtStartOfRequest = false;
try {
httpSession = ((HttpServletRequest) request).getSession(forceEagerSessionCreation);
} catch (IllegalStateException ignored) {}
if (httpSession != null) {
httpSessionExistedAtStartOfRequest = true;
Object contextFromSessionObject = httpSession.getAttribute(ACEGI_SECURITY_CONTEXT_KEY);
// Clone if required (see SEC-356)
if (cloneFromHttpSession) {
Assert.isInstanceOf(Cloneable.class, contextFromSessionObject,
"Context must implement Clonable and provide a Object.clone() method");
try {
Method m = contextFromSessionObject.getClass().getMethod("clone", new Class[] {});
if (!m.isAccessible()) {
m.setAccessible(true);
}
contextFromSessionObject = m.invoke(contextFromSessionObject, new Object[] {});
} catch (Exception ex) {
ReflectionUtils.handleReflectionException(ex);
}
}
if (contextFromSessionObject != null) {
if (contextFromSessionObject instanceof SecurityContext) {
if (logger.isDebugEnabled()) {
logger.debug("Obtained from ACEGI_SECURITY_CONTEXT a valid SecurityContext and "
+ "set to SecurityContextHolder: '" + contextFromSessionObject + "'");
}
SecurityContextHolder.setContext((SecurityContext) contextFromSessionObject);
} else {
if (logger.isWarnEnabled()) {
logger.warn("ACEGI_SECURITY_CONTEXT did not contain a SecurityContext but contained: '"
+ contextFromSessionObject
+ "'; are you improperly modifying the HttpSession directly "
+ "(you should always use SecurityContextHolder) or using the HttpSession attribute "
+ "reserved for this class? - new SecurityContext instance associated with "
+ "SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
} else {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession returned null object for ACEGI_SECURITY_CONTEXT - new "
+ "SecurityContext instance associated with SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
} else {
if (logger.isDebugEnabled()) {
logger.debug("No HttpSession currently exists - new SecurityContext instance "
+ "associated with SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
// Make the HttpSession null, as we want to ensure we don't keep
// a reference to the HttpSession laying around in case the
// chain.doFilter() invalidates it.
httpSession = null;
// Proceed with chain
int contextWhenChainProceeded = SecurityContextHolder.getContext().hashCode();
try {
chain.doFilter(request, response);
} catch (IOException ioe) {
throw ioe;
} catch (ServletException se) {
throw se;
} finally {
// do clean up, even if there was an exception
// Store context back to HttpSession
try {
httpSession = ((HttpServletRequest) request).getSession(false);
} catch (IllegalStateException ignored) {}
if ((httpSession == null) && httpSessionExistedAtStartOfRequest) {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession is now null, but was not null at start of request; "
+ "session was invalidated, so do not create a new session");
}
}
// Generate a HttpSession only if we need to
if ((httpSession == null) && !httpSessionExistedAtStartOfRequest) {
if (!allowSessionCreation) {
if (logger.isDebugEnabled()) {
logger.debug("The HttpSession is currently null, and the "
+ "HttpSessionContextIntegrationFilter is prohibited from creating an HttpSession "
+ "(because the allowSessionCreation property is false) - SecurityContext thus not "
+ "stored for next request");
}
} else if (!contextObject.equals(SecurityContextHolder.getContext())) {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession being created as SecurityContextHolder contents are non-default");
}
try {
httpSession = ((HttpServletRequest) request).getSession(true);
} catch (IllegalStateException ignored) {}
} else {
if (logger.isDebugEnabled()) {
logger.debug(
"HttpSession is null, but SecurityContextHolder has not changed from default: ' "
+ SecurityContextHolder.getContext()
+ "'; not creating HttpSession or storing SecurityContextHolder contents");
}
}
}
// If HttpSession exists, store current SecurityContextHolder contents but only if SecurityContext has
// actually changed (see JIRA SEC-37)
if ((httpSession != null)
&& (SecurityContextHolder.getContext().hashCode() != contextWhenChainProceeded)) {
httpSession.setAttribute(ACEGI_SECURITY_CONTEXT_KEY, SecurityContextHolder.getContext());
if (logger.isDebugEnabled()) {
logger.debug("SecurityContext stored to HttpSession: '" + SecurityContextHolder.getContext()
+ "'");
}
}
// Remove SecurityContextHolder contents
SecurityContextHolder.clearContext();
if (logger.isDebugEnabled()) {
logger.debug("SecurityContextHolder set to new context, as request processing completed");
}
}
}
}
public SecurityContext generateNewContext() throws ServletException {
try {
return (SecurityContext) this.context.newInstance();
} catch (InstantiationException ie) {
throw new ServletException(ie);
} catch (IllegalAccessException iae) {
throw new ServletException(iae);
}
}
public Class getContext() {
return context;
}
/**
* Does nothing. We use IoC container lifecycle services instead.
*
* @param filterConfig ignored
*
* @throws ServletException ignored
*/
public void init(FilterConfig filterConfig) throws ServletException {}
public boolean isAllowSessionCreation() {
return allowSessionCreation;
}
public boolean isForceEagerSessionCreation() {
return forceEagerSessionCreation;
}
public void setAllowSessionCreation(boolean allowSessionCreation) {
this.allowSessionCreation = allowSessionCreation;
}
public void setContext(Class secureContext) {
this.context = secureContext;
}
public void setForceEagerSessionCreation(boolean forceEagerSessionCreation) {
this.forceEagerSessionCreation = forceEagerSessionCreation;
}
// ~ Static fields/initializers
// =====================================================================================
protected static final Log logger = LogFactory.getLog(HttpSessionContextIntegrationFilter.class);
private static final String FILTER_APPLIED = "__acegi_session_integration_filter_applied";
public static final String ACEGI_SECURITY_CONTEXT_KEY = "ACEGI_SECURITY_CONTEXT";
// ~ Instance fields
// ================================================================================================
private Class context = SecurityContextImpl.class;
private Object contextObject;
/**
* Indicates if this filter can create a <code>HttpSession</code> if
* needed (sessions are always created sparingly, but setting this value to
* <code>false</code> will prohibit sessions from ever being created).
* Defaults to <code>true</code>. Do not set to <code>false</code> if
* you are have set {@link #forceEagerSessionCreation} to <code>true</code>,
* as the properties would be in conflict.
*/
private boolean allowSessionCreation = true;
/**
* Indicates if this filter is required to create a <code>HttpSession</code>
* for every request before proceeding through the filter chain, even if the
* <code>HttpSession</code> would not ordinarily have been created. By
* default this is <code>false</code>, which is entirely appropriate for
* most circumstances as you do not want a <code>HttpSession</code>
* created unless the filter actually needs one. It is envisaged the main
* situation in which this property would be set to <code>true</code> is
* if using other filters that depend on a <code>HttpSession</code>
* already existing, such as those which need to obtain a session ID. This
* is only required in specialised cases, so leave it set to
* <code>false</code> unless you have an actual requirement and are
* conscious of the session creation overhead.
*/
private boolean forceEagerSessionCreation = false;
/**
* Indicates whether the <code>SecurityContext</code> will be cloned from
* the <code>HttpSession</code>. The default is to simply reference (ie
* the default is <code>false</code>). The default may cause issues if
* concurrent threads need to have a different security identity from other
* threads being concurrently processed that share the same
* <code>HttpSession</code>. In most normal environments this does not
* represent an issue, as changes to the security identity in one thread is
* allowed to affect the security identitiy in other threads associated with
* the same <code>HttpSession</code>. For unusual cases where this is not
* permitted, change this value to <code>true</code> and ensure the
* {@link #context} is set to a <code>SecurityContext</code> that
* implements {@link Cloneable} and overrides the <code>clone()</code>
* method.
*/
private boolean cloneFromHttpSession = false;
public boolean isCloneFromHttpSession() {
return cloneFromHttpSession;
}
public void setCloneFromHttpSession(boolean cloneFromHttpSession) {
this.cloneFromHttpSession = cloneFromHttpSession;
}
public HttpSessionContextIntegrationFilter() throws ServletException {
this.contextObject = generateNewContext();
}
// ~ Methods
// ========================================================================================================
public void afterPropertiesSet() throws Exception {
if ((this.context == null) || (!SecurityContext.class.isAssignableFrom(this.context))) {
throw new IllegalArgumentException("context must be defined and implement SecurityContext "
+ "(typically use org.acegisecurity.context.SecurityContextImpl; existing class is " + this.context
+ ")");
}
if ((forceEagerSessionCreation == true) && (allowSessionCreation == false)) {
throw new IllegalArgumentException(
"If using forceEagerSessionCreation, you must set allowSessionCreation to also be true");
}
}
/**
* Does nothing. We use IoC container lifecycle services instead.
*/
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException {
if ((request != null) && (request.getAttribute(FILTER_APPLIED) != null)) {
// ensure that filter is only applied once per request
chain.doFilter(request, response);
}
else {
if (request != null) {
request.setAttribute(FILTER_APPLIED, Boolean.TRUE);
}
HttpSession httpSession = null;
boolean httpSessionExistedAtStartOfRequest = false;
try {
httpSession = ((HttpServletRequest) request).getSession(forceEagerSessionCreation);
}
catch (IllegalStateException ignored) {
}
if (httpSession != null) {
httpSessionExistedAtStartOfRequest = true;
Object contextFromSessionObject = httpSession.getAttribute(ACEGI_SECURITY_CONTEXT_KEY);
if (contextFromSessionObject != null) {
// Clone if required (see SEC-356)
if (cloneFromHttpSession) {
Assert.isInstanceOf(Cloneable.class, contextFromSessionObject,
"Context must implement Clonable and provide a Object.clone() method");
try {
Method m = contextFromSessionObject.getClass().getMethod("clone", new Class[] {});
if (!m.isAccessible()) {
m.setAccessible(true);
}
contextFromSessionObject = m.invoke(contextFromSessionObject, new Object[] {});
}
catch (Exception ex) {
ReflectionUtils.handleReflectionException(ex);
}
}
if (contextFromSessionObject instanceof SecurityContext) {
if (logger.isDebugEnabled()) {
logger.debug("Obtained from ACEGI_SECURITY_CONTEXT a valid SecurityContext and "
+ "set to SecurityContextHolder: '" + contextFromSessionObject + "'");
}
SecurityContextHolder.setContext((SecurityContext) contextFromSessionObject);
}
else {
if (logger.isWarnEnabled()) {
logger
.warn("ACEGI_SECURITY_CONTEXT did not contain a SecurityContext but contained: '"
+ contextFromSessionObject
+ "'; are you improperly modifying the HttpSession directly "
+ "(you should always use SecurityContextHolder) or using the HttpSession attribute "
+ "reserved for this class? - new SecurityContext instance associated with "
+ "SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession returned null object for ACEGI_SECURITY_CONTEXT - new "
+ "SecurityContext instance associated with SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
}
else {
if (logger.isDebugEnabled()) {
logger.debug("No HttpSession currently exists - new SecurityContext instance "
+ "associated with SecurityContextHolder");
}
SecurityContextHolder.setContext(generateNewContext());
}
// Make the HttpSession null, as we want to ensure we don't keep
// a reference to the HttpSession laying around in case the
// chain.doFilter() invalidates it.
httpSession = null;
// Proceed with chain
int contextWhenChainProceeded = SecurityContextHolder.getContext().hashCode();
try {
chain.doFilter(request, response);
}
catch (IOException ioe) {
throw ioe;
}
catch (ServletException se) {
throw se;
}
finally {
// do clean up, even if there was an exception
// Store context back to HttpSession
try {
httpSession = ((HttpServletRequest) request).getSession(false);
}
catch (IllegalStateException ignored) {
}
if ((httpSession == null) && httpSessionExistedAtStartOfRequest) {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession is now null, but was not null at start of request; "
+ "session was invalidated, so do not create a new session");
}
}
// Generate a HttpSession only if we need to
if ((httpSession == null) && !httpSessionExistedAtStartOfRequest) {
if (!allowSessionCreation) {
if (logger.isDebugEnabled()) {
logger
.debug("The HttpSession is currently null, and the "
+ "HttpSessionContextIntegrationFilter is prohibited from creating an HttpSession "
+ "(because the allowSessionCreation property is false) - SecurityContext thus not "
+ "stored for next request");
}
}
else if (!contextObject.equals(SecurityContextHolder.getContext())) {
if (logger.isDebugEnabled()) {
logger.debug("HttpSession being created as SecurityContextHolder contents are non-default");
}
try {
httpSession = ((HttpServletRequest) request).getSession(true);
}
catch (IllegalStateException ignored) {
}
}
else {
if (logger.isDebugEnabled()) {
logger
.debug("HttpSession is null, but SecurityContextHolder has not changed from default: ' "
+ SecurityContextHolder.getContext()
+ "'; not creating HttpSession or storing SecurityContextHolder contents");
}
}
}
// If HttpSession exists, store current
// SecurityContextHolder contents but only if
// SecurityContext has
// actually changed (see JIRA SEC-37)
if ((httpSession != null)
&& (SecurityContextHolder.getContext().hashCode() != contextWhenChainProceeded)) {
httpSession.setAttribute(ACEGI_SECURITY_CONTEXT_KEY, SecurityContextHolder.getContext());
if (logger.isDebugEnabled()) {
logger.debug("SecurityContext stored to HttpSession: '" + SecurityContextHolder.getContext()
+ "'");
}
}
// Remove SecurityContextHolder contents
SecurityContextHolder.clearContext();
if (logger.isDebugEnabled()) {
logger.debug("SecurityContextHolder set to new context, as request processing completed");
}
}
}
}
public SecurityContext generateNewContext() throws ServletException {
try {
return (SecurityContext) this.context.newInstance();
}
catch (InstantiationException ie) {
throw new ServletException(ie);
}
catch (IllegalAccessException iae) {
throw new ServletException(iae);
}
}
public Class getContext() {
return context;
}
/**
* Does nothing. We use IoC container lifecycle services instead.
*
* @param filterConfig ignored
*
* @throws ServletException ignored
*/
public void init(FilterConfig filterConfig) throws ServletException {
}
public boolean isAllowSessionCreation() {
return allowSessionCreation;
}
public boolean isForceEagerSessionCreation() {
return forceEagerSessionCreation;
}
public void setAllowSessionCreation(boolean allowSessionCreation) {
this.allowSessionCreation = allowSessionCreation;
}
public void setContext(Class secureContext) {
this.context = secureContext;
}
public void setForceEagerSessionCreation(boolean forceEagerSessionCreation) {
this.forceEagerSessionCreation = forceEagerSessionCreation;
}
}

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