[LANG-349] Deadlock using ReflectionToStringBuilder

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Won't Fix
• Affects Version/s: 2.0
• Fix Version/s: 2.4

Environment

java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Server VM (build 1.5.0_10-b03, mixed mode)

>uname -a
Linux fwjsfimat04 2.4.21-32.EL #1 SMP Fri Apr 15 21:02:58 EDT 2005 x86_64 x86_64 x86_64 GNU/Linux

• Assignee: Unassigned
• Reporter: David I.
• Created: 18/Jul/07 18:21
• Updated: 16/Oct/07 04:26
• Resolved: 16/Oct/07 04:26

Description

I used the ReflectionToStringBuilder on an object to output debugging messages to Log4j. If this object was picked up by two different threads and the toString() method was called at the same time in two different threads, a deadlock occurrs.

Here is a stack trace from using jstack:

Thread 1172: (state = BLOCKED)

• java.util.Vector.hashCode() @bci=0, line=938 (Interpreted frame)
• java.util.HashMap.containsKey(java.lang.Object) @bci=6, line=377 (Compiled frame)
• org.apache.commons.lang.builder.ReflectionToStringBuilder.toString() @bci=50, line=522 (Compiled frame)
• org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(java.lang.Object, org.apache.commons.lang.builder.ToStringStyle, boolean, java.lang.Class) @bci=12, line=265 (Interpreted frame)
• org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(java.lang.Object, org.apache.commons.lang.builder.ToStringStyle) @bci=4, line=197 (Interpreted frame)
• org.apache.commons.lang.builder.ToStringBuilder.reflectionToString(java.lang.Object, org.apache.commons.lang.builder.ToStringStyle) @bci=2, line=170 (Interpreted frame)
  [...]

Thread 1191: (state = BLOCKED)

• java.util.Vector.hashCode() @bci=0, line=938 (Interpreted frame)
• java.util.HashMap.containsKey(java.lang.Object) @bci=6, line=377 (Compiled frame)
• org.apache.commons.lang.builder.ReflectionToStringBuilder.toString() @bci=50, line=522 (Compiled frame)
  [...]