Question

Java Service Wrapper is the tools I need to run as a Windows service but came into a problem with java.lang.ClassNotFoundException

My default command line is: java -jar software.jar

I have update the wrapper.conf for running software.jar located in D:\ and there was an error, the changes I have made:

# Java Classpath (include wrapper.jar)  Add class path elements as
#  needed starting from 1
wrapper.java.classpath.1=../software.jar
wrapper.java.classpath.2=../lib/wrapper.jar

and what should I put for this parameter? If I comment out, it would use Main class

wrapper.java.mainclass=software

As I declare “software” as the main class, I got the dread error:

wrapper  | Launching a JVM...
jvm 1    | java.lang.NoClassDefFoundError: org/xsocket/connection/IHandler
jvm 1    | Caused by: java.lang.ClassNotFoundException: org.xsocket.connection.I
Handler
jvm 1    |      at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
jvm 1    |      at java.security.AccessController.doPrivileged(Native Method)
jvm 1    |      at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
jvm 1    |      at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
jvm 1    |      at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

jvm 1    |      at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
jvm 1    | Could not find the main class: xSocketServer.  Program will exit.
wrapper  | JVM exited while loading the application.
jvm 1    | Exception in thread "main"
wrapper  | CTRL-C trapped.  Shutting down.
wrapper  | <-- Wrapper Stopped

My software.jar contains:

META-INF
org -- Eclipse setting
software.class
xsoftwareHandler.class
xSocket.jar

Answer 1

What I suggest is to store all libraries in your lib/ directory and then add the following information in your wrapper.conf file:

wrapper.java.classpath.1=../lib/*.jar

This way, the Java Service Wrapper will load all the *.jar file located in ../lib/ directory in the classpath, and you should not get this error again.

Of course, you can also define each JAR individually if you prefer:

wrapper.java.classpath.1=../lib/wrapper.jar
wrapper.java.classpath.2=../software.jar
wrapper.java.classpath.3=../lib/xSocket.jar
...