[rules-users] execution using "java -jar x.jar ..." fails

[Wolfgang Laun]

OK. thanks.

Here is a sample MANIFEST, to be included in the application jar, with the
jars I've found essential for running a plain Expert application (without
XML rules or commands):

Manifest-Version: 1.0
Class-Path: /extra/drools-5.1.0.M2/drools-api-5.1.0.M2.jar
/extra/drools-5.1.0.M2/drools-compiler-5.1.0.M2.jar
/extra/drools-5.1.0.M2/drools-core-5.1.0.M2.jar
/extra/drools-5.1.0.M2/lib/mvel2-2.0.16.jar
/extra/drools-5.1.0.M2/lib/antlr-runtime-3.1.3.jar
/usr/local/eclipse/plugins/org.eclipse.jdt.core_3.4.4.v_894_R34x.jar
Main-Class: rss.aws.init.Main

Eclipse's support for creating a jar isn't really helpful - I'd say it's
confusing. I simply called
   jar -fm myappl.jar MANIFEST ... # dirs where class and rules files are

Thanks for the help. (My son simply said, "Why didn't you ask me?" - That's
how it goes...)

-W


2010/6/23 Greg Barton <greg_barton at yahoo.com>

> See  <http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/java.html>
> http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/java.html
>
> Key line' referring to the -jar option:
>
> "When you use this option, the JAR file is the source of all user classes,
> and other user class path settings are ignored."
>
> You can specify the path to external jars in the manifest of the standalone
> jar.
>
> GreG
>
> On Jun 23, 2010, at 9:44 AM, Wolfgang Laun <wolfgang.laun at gmail.com>
> wrote:
>
> The application works fine in Eclipse.
>
> In Eclipse, I created a jar file x.jar from the .class and a few .drl
> files, and copied x.jar to /tmp/x/
>
> Now, in /tmp/x
>    CP="droos/*:drools/lib/*"
>    java -cp "$CP" -jar dpvt.jar par...
> This fails on the first attempt to access any class from a drools jar file.
>
> In /tmp/x, I unpack x.jar and call
>    CP="droos/*:drools/lib/*:."
>    java -cp "$CP" rss.aws.init.Main par...
> AND THIS WORKS!
>
> So, what is different when starting a Java program with java -jar as
> opposed
> to java x.y.Main?
>
> The stack dump is not very informative:
>
> java.lang.NoClassDefFoundError: org/drools/KnowledgeBaseFactory
>     at rss.aws.engine.impl.DroolsEngine.setup(DroolsEngine.java:30)
>     at rss.aws.init.Core.init(Core.java:51)
>     at rss.aws.init.Core.getInstance(Core.java:16)
>     at rss.aws.init.Main.<init>(Main.java:35)
>     at rss.aws.init.Main.main(Main.java:191)
> Caused by: java.lang.ClassNotFoundException:
> org.drools.KnowledgeBaseFactory
>     at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:319)
>     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:264)
>     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332)
>     ... 5 more
>
>  Any ideas?
> -W
>
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