Revision as of 11:50, 2 December 2009

Running JPA 2.0 API on WebLogic 10.3

Analysis

• EclipseLink 1.2 and 2.0+ fully implement the JPA 2.0 specification via enhancement # 248291 and are the RI for the GlassFish V3 JEE6 server. In order to use this functionality the 2.0 version of the JPA specification jar - javax.persistence.jar must be added higher in the WebLogic server classpath see enhancement # 296271.
• Now, you may have noticed that the modules/org.eclipse.persistence_1.0.0.0_1-2-0.jar jar contains JPA 2.0 API implementation classes such as org.eclipse.persistence.internal.jpa.metamodel - however this API is not available through interface classes (because only the javax.persistence 1.0 is present) and we also are missing the services file for Criteria/Metamodel - in any case a predeploy should fail where the EAR contains JPA 2.0 API out of the box.

Design

Design Issue 1: JSR-317 JPA 2.0 EJB 3.1 Support

DI 1: Problem

• The modules currently shipped with WebLogic 10.3.2.0 (Patch Set 1) in are the following JPA 1.0 compatible versions - these must be overriden in order to run JPA 2.0 API.
  • modules/org.eclipse.persistence_1.0.0.0_1-2-0.jar
  • modules/javax.persistence_1.0.0.0_1-0-2.jar

DI 1: Alternative 1: Manual overwrite of eclipselink and javax.persistence libraries in modules

• Current solution - this should be deprecated.

DI 1: Alternative 2: Reference higher in the server classpath via commEnv.cmd

• Workable solution but it has issues
  • The server now runs a single version of the two libraries for all applications - this may not be compatible with older applications or other JPA providers running on the server.

DI 1: Solution

• In <WEBLOGIC_HOME>\wlserver_10.3\common\bin\commEnv.cmd
  • change
    • set WEBLOGIC_CLASSPATH=%JAVA_HOME%\lib\tools.jar...
  • To
    • set WEBLOGIC_CLASSPATH=F:/view_w35d/jpa/plugins/javax.persistence_2.0.0.v200911041116.jar;%JAVA_HOME%\lib\tools.jar...
    • where F:/view_w35d == %SVN_TRUNK
• Note: do not use the javax.persistence_2.0_preview.jar - the dated javax.persistence_2.0.0.v200911041116.jar one is the final PFD version for the JPA 2.0 specification.

DI 1: Alternative 3: Application Level Shared Library

• 20091202 - scope is not large enough - deprecated.

DI 1: Alternative 4: Global Level Shared Library

• 20091202 - in progress
• We need to respond to the post about the FilterClassLoader with the procedure on creating a shared library for JPA 2.0 and EclipseLink 2.0 that is above the modules directory on WebLogic classpath.
• see http://download.oracle.com/docs/cd/E12840_01/wls/docs103/programming/classloading.html

DI 1: Alternative 5: Domain Extension Template

• 20091202 - This one suggested by Doug - similar to what is done for other vendor libraries.