Hei there.
I'm programming a game with lwjgl with vim and I'm trying to debug with jdb but I'm having some problems.
First of all I show you the tree of my project. (The main class is Engine.java).
.
├── build
│ ├── classes
│ │ └── com
│ │ └── ionsoft
│ │ ├── engine
│ │ │ ├── Draw.class
│ │ │ ├── Engine.class
│ │ │ └── Timer.class
│ │ └── game
│ │ └── Game.class
│ └── jar
│ └── Jump2Box.jar
├── build.properties
├── build.xml
├── lib
│ ├── jars
│ │ ├── lwjgl.jar
│ │ ├── lwjgl_util.jar
│ │ └── slick-util.jar
│ └── natives-linux
│ ├── libjinput-linux64.so
│ ├── libjinput-linux.so
│ ├── liblwjgl64.so
│ ├── liblwjgl.so
│ ├── libopenal64.so
│ └── libopenal.so
├── LICENCE
├── README
├── src
│ └── com
│ └── ionsoft
│ ├── engine
│ │ ├── Draw.java
│ │ ├── Engine.java
│ │ └── Timer.java
│ └── game
│ └── Game.java
└── tags
I'm compiling my project with ant using the javac debug option. Here there is the part for the compilation in build.xml file:
<!-- Compile -->
<target name="compile">
<mkdir dir="${classes.dir}" />
<javac srcdir="${src.dir}" destdir="${classes.dir}" classpathref="classpath" debug="true" includeantruntime="false" />
</target>
The problem shows up when I'm trying to debug the application. I readed the man page and I saw that there is a classpath option. Since I'm using lwjgl I supose that I need to include the path to the .class files.
I'm executing this code form the root of the project.
ruby@Cedrus ~/development/java/projects/Jump2Box $ jdb -classpath build/classes com.ionsoft.engine.Engine
Initializing jdb ...
> run
run com.ionsoft.engine.Engine
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
>
VM Started:
Exception occurred: java.lang.ClassNotFoundException (uncaught)"thread=main", java.lang.ClassLoader.loadClass(), line=436 bci=121
main[1] cont
Exception in thread "main" > java.lang.NoClassDefFoundError: org/lwjgl/LWJGLException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2521)
at java.lang.Class.getMethod0(Class.java:2764)
at java.lang.Class.getMethod(Class.java:1653)
at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.LWJGLException
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 6 more
The application exited
I also noticed about this strange exceptions.
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
I found this post here that explains the solution.
ignore uncaught java.lang.Throwable
I'm not sure where I need to put this line of code in order to solve this. I also need to include the .class for lwjgl? I don't know what I'm doing wrong.
UPDATE:
I included lwjgl into my classpath and it's still now working well. I also included the path to my source files.
ruby@Cedrus ~/development/java/projects/Jump2Box $ jdb -launch -classpath build/classes/com/ionsoft/engine/:build/classes/com/ionsoft/game/:lib/jars/ -sourcepath src/com/ionsoft/engine/:src/com/ionsoft/game/ Engine
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
Initializing jdb ...
>
VM Started: No frames on the current call stack
main[1] stop in Engine.main
Deferring breakpoint Engine.main.
It will be set after the class is loaded.
main[1] cont
>
Exception occurred: java.lang.NoClassDefFoundError (uncaught)"thread=main",java.lang.ClassLoader.loadClass(), line=436 bci=121
main[1] next
Excep> tion in thread "main" java.lang.NoClassDefFoundError: Engine (wrong name: com/ionsoft/engine/Engine)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
The application exited
If I try to run JVM as a server of jdb the same error shows up.
Setting up JVM server
ruby@Cedrus ~/development/java/projects/Jump2Box $ java -classpath build/classes/com/ionsoft/engine/:build/classes/com/ionsoft/game/:lib/jars/ -agentlib:jdwp=transport=dt_socket,address=localhost:8888,server=y,suspend=y Engine
Listening for transport dt_socket at address: 8888
Connecting with jdb
ruby@Cedrus ~/development/java/projects/Jump2Box $ jdb -sourcepath src/com/ionsoft/engine/:src/com/ionsoft/game/ -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8888
Set uncaught java.lang.Throwable
Set deferred uncaught java.lang.Throwable
Initializing jdb ...
>
VM Started: No frames on the current call stack
main[1] stop in Engine.main
Deferring breakpoint Engine.main.
It will be set after the class is loaded.
main[1] cont
>
Exception occurred: java.lang.NoClassDefFoundError (uncaught)"thread=main",java.lang.ClassLoader.loadClass(), line=436 bci=121
main[1] list
Source file not found: ClassLoader.java
main[1] next
>
The application exited
In the point when "Exception ocurred" the JVM shows up the same error.
Exception in thread "main" java.lang.NoClassDefFoundError: Engine (wrong name: com/ionsoft/engine/Engine)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)
I see that there is a problem with the names but I don't know how to solve it.
When I run my jar file with lwjgl I need to attach the native files to the jar. I do this operation using ant. Here it is the target with I do this operation.
<!-- Run generated jar -->
<target name="run" depends="jar">
<java fork="true" classname="${main-class}">
<classpath>
<path refid="classpath" />
<path location="${jar.dir}/${ant.project.name}.jar" />
</classpath>
<sysproperty key="java.library.path" value="${lwjgl_natives.dir}" /> </java>
</target>
Thank you for your time.
To solve this problem I need to do 3 things.
Here I add the working commands for ther JVM server and JDB client:
# JVM server
java -classpath ./build/classes:./lib/jars/lwjgl.jar -Djava.library.path=./lib/natives-linux -agentlib:jdwp=transport=dt_socket,address=localhost:8888,server=y,suspend=y com.ionsoft.engine.Engine
# JDB client
jdb -sourcepath ./src -connect com.sun.jdi.SocketAttach:hostname=localhost,port=8888
Hope that this help someone.