Jetty doesn't start from WTP plugin

When I start Jetty server in Eclipse (using the jetty-wtp plugin) the console output this error message： Caused by: java.lang.NoClassDefFoundError: javax/transaction/UserTransaction

My installed environment is:

1. JDK 1.6.0
2. jetty 8.0.0.M2
3. jetty-wtp

开发者_运维知识库How can I solve this?

Try adding the JTA API to your classpath. You can download from the java.net Maven repo at

http://download.java.net/maven/2/javax/transaction/jta/

"uhhh. how do i add the JTA JAR to the CP"

Go to the "Server" view (I use the bottom left list popup list), then double-click on the Jetty Server at localhost. This will bring up the configuration. Select "open launch configuration" underlined link. This brings up a configuration panel, then add to the classpath the missing jar: javax.transaction_1.1.1. This jar is located in the jetty/lib dir. I was looking for it on Oracle website, but there, the link is broken.