https://bz.apache.org/bugzilla/show_bug.cgi?id=58635
Bug ID: 58635
Summary: Break point at java agent code is ignored during
catalina.sh jpda run
Product: Tomcat 9
Version: 9.0.0.M1
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: huxing.zh...@gmail.com
Steps to reproduce this issue:
1. prepare a simple java agent, named TestJavaAgent
2. add a break point to the premain method of TestJavaAgent
3. modify bin/setenv.sh:
export JPDA_SUSPEND=y
export CATALINA_OPTS="$CATALINA_OPTS -javaagent:/path/to/test/java/agent.jar"
4. start tomcat in debugging mode:
bin/catalina.sh jpda run
Expected behavior:
The tomcat prompts "Listening for transport dt_socket at address: 8000", and
when attach a debugger to port 8000, the process stops at the break point in
premain method of TestJavaAgent
Actual behavior:
The premain method of TestJavaAgent has been executed, and then tomcat prompts
"Listening for transport dt_socket at address: 8000", the process never stopped
at the break point in premain method of TestJavaAgent
Putting $JPDA_OPTS before $CATALINA_OPTS will solve this issue:
Index: bin/catalina.sh
===================================================================
--- bin/catalina.sh (revision 1715719)
+++ bin/catalina.sh (working copy)
@@ -279,7 +279,7 @@
if [ -z "$JPDA_OPTS" ]; then
JPDA_OPTS="-agentlib:jdwp=transport=$JPDA_TRANSPORT,address=$JPDA_ADDRESS,server=y,suspend=$JPDA_SUSPEND"
fi
- CATALINA_OPTS="$CATALINA_OPTS $JPDA_OPTS"
+ CATALINA_OPTS="$JPDA_OPTS $CATALINA_OPTS"
shift
fi
Note: setting -agentlib=/path/to/agent.jar to JAVA_OPTS won't fix this issue,
neither. Because JAVA_OPTS always goes before CATALINA_OPTS.
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