Remote debugging a Java application

Question

I have a java application running on linux machine   I run the java application using the following   java myapp -Xdebug -Xrunjdwp server y transport dt socket address 4000  suspend n   I have opened port 4000 for TCP on this Linux machine   I use eclipse from Windows XP machine and try to connect to this application   I have opened the port in windows also   Both machines are on the LAN but I can t seem to connect the debugger to the Java application   What am I doing wrong

User · Answer

Steps    Start your remote java application with debugging options as said in above post    Configure Eclipse for remote debugging by specifying host and port    Start remote debugging in Eclipse and wait for connection to succeed    Setup breakpoint and debug    If you want to debug from start of application use suspend y   this will keep remote application suspended until you connect from eclipse    See Step by Step guide on Java remote debugging for full details

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Edit  I noticed that some people are cutting and pasting the invocation here  The answer I originally gave was relevant for the OP only  Here s a more modern invocation style  including using the more conventional port of 8000    java -agentlib jdwp transport dt socket server y address 8000 suspend n  lt other arguments gt    Original answer follows     Try this   java -Xdebug -Xrunjdwp server y transport dt socket address 4000 suspend n myapp   Two points here    No spaces in the runjdwp option  Options come before the class name  Any arguments you have after the class name are arguments to your program

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For JDK 1 3 or earlier     -Xnoagent -Djava compiler NONE -Xdebug -Xrunjdwp transport dt socket server y suspend n address 6006   For JDK 1 4   -Xdebug -Xrunjdwp transport dt socket server y suspend n address 6006   For newer JDK    -agentlib jdwp transport dt socket server y suspend n address 6006   Please change the port number based on your needs   From java technotes      From 5 0 onwards the -agentlib jdwp option is used to load and specify   options to the JDWP agent  For releases prior to 5 0  the -Xdebug and   -Xrunjdwp options are used  the 5 0 implementation also supports the -Xdebug and -Xrunjdwp options but the newer -agentlib jdwp option is preferable as the JDWP agent in 5 0 uses the JVM TI interface to the   VM rather than the older JVMDI interface    One more thing to note  from JVM Tool interface documentation      JVM TI was introduced at JDK 5 0  JVM TI replaces the Java Virtual Machine Profiler Interface  JVMPI  and the Java Virtual Machine Debug Interface  JVMDI  which  as of JDK 6  are no longer provided

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Answer covering Java    9   For Java 9   the JVM option needs a slight change by prefixing the address with the IP address of the machine hosting the JVM  or just     -agentlib jdwp transport dt socket server y address   8000 suspend n   This is due to a change noted in https   www oracle com technetwork java javase 9-notes-3745703 html JDK-8041435   For Java  lt  9  the port number is enough to connect

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This is how you should setup Eclipse Debugger for remote debugging   Eclipse Settings     1 Click the Run Button 2 Select the Debug Configurations 3 Select the    Remote Java Application    4 New Configuration    Name   GatewayPortalProject Project   GatewayPortal-portlet Connection Type  Socket Attach Connection Properties   i   localhost   ii  8787     For JBoss   1 Change the  path toJboss jboss-eap-6 1 bin standalone conf in your vm as follows     Uncomment the following line by removing the     JAVA OPTS   JAVA OPTS -agentlib jdwp transport dt socket address 8787 server y suspend n    For Tomcat    In catalina bat file    Step 1    CATALINA OPTS  -Xdebug -Xrunjdwp transport dt socket address 8000 server y suspend n    Step 2    JPDA OPTS  -agentlib jdwp transport dt socket address 8000 server y suspend n    Step 3  Run Tomcat from command prompt like below    catalina sh jpda start   Then you need to set breakpoints in the Java classes you desire to debug

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I d like to emphasize that order of arguments is important   For me  java -agentlib jdwp transport dt socket server y suspend n address 8000 -jar app jar command opens debugger port   but java -jar app jar -agentlib jdwp transport dt socket server y suspend n address 8000 command doesn t

[java] Remote debugging a Java application

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