Re: [Php-java-bridge-users] NoClassDefFound error - how do I resolve?

[<php...@li...>]

Hi,

please excuse the delay.


> Looking back at the docs for the Bridge, it says
> that if you get a  
> "NoClassDefFound" error it means there is another
> class that the  
> current class is trying to reference or call that is
> missing (so the  
> Client->runTransaction is missing something).

Yes. There are proposals to add a SML style "module
system" to Java and/or to add a global repository for
Java classes (similar to the global assembly cache
used by .NET).

Until this is implemented I suggest to use the
JavaBridge.war as a back end and to store all
necessary java libraries to the WEB-INF/lib/ folder
within the JavaBridge.war file.

> Does this mean that the four java_require statements

The classes loaded by one java_require statement
cannot see the classes loaded by the other
java_require statements, see
http://php-java-bridge.sourceforge.net/documentation/PHP-API/html/java_8c.html#doc23.

Merging the 4 statements into one may solve the
problem.

 
> If it means that there is some other JAR I need a
> java_require for,  
> how do I go about finding what JAR I should
> include???

Good question. From the README
(http://php-java-bridge.sourceforge.net/README):

  Sun java platform issues
  ------------------------

  The sun java platform does not support java
"modules". This causes
  certain problems when running java programs. When
you compile a class
  foo which references a class bar and ship the class
foo without
  providing bar, the sun java platform will not
complain unless the user
  accidentally calls a method which references the
non-existing class. If
  this happens, a "NoClassDefFound" error is thrown.
This error may
  not(!) indicate which class is missing and it
certainly does not
  indicate which external library is missing. The
tests.php4 folder
  contains two tests, noClassDefFound.php and
noClassDefFound2.php which
  demonstrate this.

  To avoid this problem please document *exactly*
(including the
  version number) which external libraries (.jar
files) your software
  needs. If you have written software where certain
methods require an
  optional library, please document this in the method
header.

  If receive this error when using a Java library,
this may mean the
  following:

    * an old or different JDK than expected by the
library is used,
      for example GNU Java instead of SUN or IBM Java.

    * java_require("foo.jar");
java_require("bar.jar"); was used instead of
      java_require("foo.jar;bar.jar"); to load two
interconnected libraries.

    * the library is simply broken or it expects
certain parameters in
      its environment (applet parameter or system
property or property file).

    * the library may only work within a J2EE
environment from a
      certain vendor, for example the WebSphere
Application server or
      the Sun Java Application server.


Regards,
Jost Boekemeier



		
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