4/20/2010

@Resource.lookup and classpath

JavaEE 6 added a new lookup attribute to @javax.annotation.Resource. So one can inject resources like this:

@Resource(lookup = "java:module/env/rate")
private String rate;
Compile the classes:
javac -cp "$GLASSFISH_HOME/modules/*" *Bean.java

EmailBean.java:18: cannot find symbol
symbol : method lookup()
location: @interface javax.annotation.Resource
@Resource(lookup = "java:module/env/rate")
^
1 error
In GlassFish, all JavaEE classes are in various jars under $GLASSFISH_HOME/modules and its subdirectories. It failed because version 1.0 of javax.annotation.Resource class (and other javax.annotation.* classes) are included in Java SE 6. The use of lookup attribute requires version 1.1 of Common Annotation jar, which is included in JavaEE 6.

To fix it, simply add a -Djava.endorsed.dirs sysprop to override those classes in Java SE 6:
javac -cp "$GLASSFISH_HOME/modules/*" -Djava.endorsed.dirs=$GLASSFISH_HOME/modules/endorsed  *Bean.java
In Eclipse IDE, you just need to put $GLASSFISH_HOME/modules/endorsed/javax.annotation.jar before JRE System Library when configuring Java Build Path.

This should also work with any compliant appserver, though actual jar name and location may vary. The same -Djava.endorsed.dirs sysprop should also be used when running the app.

6 comments:

Frederik Mortensen said...

If you are using Maven, you can also do the following changes to your pom to handle the resource problem:

http://java-abwaschbar.blogspot.com/2011/01/resource-annotation-and-lookup.html

hedonplay said...

Thanks for your solution.

Anonymous said...

Sun are fucking freaks to come up with different JEE and JSE implementations

Javin said...

You have a wonderful blog man I really like your short and useful tips , this is something I didn't know but looks quite interesting to me.

Thanks
How classpath works in Java, Setting classpath in Unix and windows

Anna said...

Great and Useful Article.

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