From df1dede57f2ac4c5e6e1cd8b1d25af8ca5f4497a Mon Sep 17 00:00:00 2001
From: Phillip Webb <pwebb@pivotal.io>
Date: Fri, 12 Dec 2014 18:56:34 -0800
Subject: [PATCH] Substitute ${PID} variables with file logging

Update DefaultLogbackConfiguration to include OptionHelper.substVars
when setting the encoder pattern so that ${PID} is correctly expanded.

Fixes gh-2119
---
 .../boot/logging/logback/DefaultLogbackConfiguration.java       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java b/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
index 958ddce7716..dab8d1159bd 100644
--- a/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
+++ b/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
@@ -112,7 +112,7 @@ class DefaultLogbackConfiguration {
 			String logFile) {
 		RollingFileAppender<ILoggingEvent> appender = new RollingFileAppender<ILoggingEvent>();
 		PatternLayoutEncoder encoder = new PatternLayoutEncoder();
-		encoder.setPattern(FILE_LOG_PATTERN);
+		encoder.setPattern(OptionHelper.substVars(FILE_LOG_PATTERN, config.getContext()));
 		appender.setEncoder(encoder);
 		config.start(encoder);