Remote debugging java web start under JVM 1.8

Question

I have a Java Web Start application, which I used to start through a shortcut:

\"C:\\Program Files\\Java\\jdk1.7.0_67\\bin\\javaws.exe\" -J-Dfile.encoding=UT         


        

Answer 1

Starting from the (approximately) version 1.7.0_022 java web start launcher significantly alters list of supplied JVM-arguments and properties by treating vast of them as unsecured.

You can set the JAVA_TOOL_OPTIONS environment variable with described above debug switches instead of java control panel parameters before running JNLP file. (See http://www.oracle.com/technetwork/java/javase/envvars-138887.html#gbmsy and http://docs.oracle.com/javase/8/docs/platform/jvmti/jvmti.html#tooloptions). This is the correction of the previous Ivan' answer.

For example, you can try the following batch-file which was tested for JDK 1.8.0_60:

setlocal

set JAVAWS_TRACE_NATIVE=1
set JAVA_TOOL_OPTIONS=-agentlib:jdwp=transport=dt_socket,address=8002,server=y,suspend=n %JAVA_TOOL_OPTIONS%

set JAVA_HOME_64=c:\Java\64\jdk1.8
set JAVA_HOME=%JAVA_HOME_64%
set JDK_JRE_HOME=%JAVA_HOME%\jre
set JRE_HOME=%JDK_JRE_HOME%

set ONLINE_JNLP_URL=http://pont/dms/InstallDMS_debug.jnlp

"%JRE_HOME%\bin\javaws" %ONLINE_JNLP_URL%

endlocal

Additionally, I would like to notice that for remote debugging of Java WS-applications it is essential to run JDK's JRE but not public JRE, otherwise you can observe that JVM terminates before executing your main class.

Answer 2

Blatantly stealing Saeid Nourian's comment-answer:

Add -Xdebug -agentlib:jdwp=transport=dt_socket,address=9999,server=y,suspend=y to the arguments in the Java Control Panel.

Answer 3

After all it still works with

set JAVA_TOOLS=-agentlib:jdwp=transport=dt_socket,address=9999,server=y,suspend=y

in bat file.