PlayFramework 2.x和playorm ClassNotFoundException：play.Plugin

Question

我試圖通過PlayFramework 2.x連接到cassandra，但我得到了常見的異常ClassNotFoundException：play.Plugin。我已經完成了維基頁面https://github.com/deanhiller/playorm/wiki/PlayFramework-2.x-support上的所有內容。這裏是我的maven（我使用mvn repository中的playorm.jar）項目http://code.google.com/p/cassandranosql-firebrandocm-playorm/source/browse/trunk/，如你所見，有一個測試類UserPlayormDaoImplTest，其中被稱爲NoSql.em（）;拋出ClassNotFoundException。我將plugin2.1.jar添加到類路徑中，但是它找不到該類。我不知道什麼可能是錯的。感謝幫助。

堆棧跟蹤：

java.lang.NoClassDefFoundError: play/Plugin 
at java.lang.ClassLoader.defineClass1(Native Method) 
at java.lang.ClassLoader.defineClass(Unknown Source) 
at java.security.SecureClassLoader.defineClass(Unknown Source) 
at java.net.URLClassLoader.defineClass(Unknown Source) 
at java.net.URLClassLoader.access$100(Unknown Source) 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.Class.forName0(Native Method) 
at java.lang.Class.forName(Unknown Source) 
at com.alvazan.play.NoSql.<clinit>(NoSql.java:16) 
at cz.muni.fi.cassandra.Playorm.UserPlayormDaoImplTest.setUp(UserPlayormDaoImplTest.java:34) 
at junit.framework.TestCase.runBare(TestCase.java:132) 
at junit.framework.TestResult$1.protect(TestResult.java:110) 
at junit.framework.TestResult.runProtected(TestResult.java:128) 
at junit.framework.TestResult.run(TestResult.java:113) 
at junit.framework.TestCase.run(TestCase.java:124) 
at junit.framework.TestSuite.runTest(TestSuite.java:243) 
at junit.framework.TestSuite.run(TestSuite.java:238) 
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 
Caused by: java.lang.ClassNotFoundException: play.Plugin 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
... 30 more 

Answer 1

哪打版使用的是？ play.Plugin是play2.1.0框架的組成部分。你能否檢查位於play-2.1.0/repository/local/play/play_2.10/2.1.0/jars/play_2.10.jar的jar「play_2.10.jar」是否在你項目的類路徑中。

Answer 2

我的錯，我沒有將play_2.10.jar從play-2.1.0/repository/local/play/play_2.10/2.1.0/jars/play_2.10.jar添加到我的項目的類路徑中。我正在使用playframework 2.1.0（從playframework網站下載）。我加了那個jar，但現在我和其他班有類似的問題。似乎在classpath中有更多的缺少jar。 Stacktrace：

java.lang.NoClassDefFoundError: scala/Function0 
at play.api.Play.current(Play.scala) 
at play.Play.application(Play.java:12) 
at com.alvazan.play2.NoSqlForPlay2.em(NoSqlForPlay2.java:25) 
at com.alvazan.play.NoSql.em(NoSql.java:60) 
at cz.muni.fi.cassandra.Playorm.UserPlayormDaoImplTest.setUp(UserPlayormDaoImplTest.java:35) 
at junit.framework.TestCase.runBare(TestCase.java:132) 
at junit.framework.TestResult$1.protect(TestResult.java:110) 
at junit.framework.TestResult.runProtected(TestResult.java:128) 
at junit.framework.TestResult.run(TestResult.java:113) 
at junit.framework.TestCase.run(TestCase.java:124) 
at junit.framework.TestSuite.runTest(TestSuite.java:243) 
at junit.framework.TestSuite.run(TestSuite.java:238) 
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 
Caused by: java.lang.ClassNotFoundException: scala.Function0 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
... 19 more