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I developed a Java project in which I wrote some Scala classes and some Java classes. I used Scala-Neo4j wrapper in the project to write Scala functions for inserting and retrieval of Neo4j nodes. I also wrote Thrift services in java in the project as I need to call these Scala functions from Php. Finally I extracted a jar file using Eclipse and I tried to run it from the command line and I got the following Exception

Exception in thread "main" java.lang.NoClassDefFoundError: org/neo4j/scala/Neo4jWrapper
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at dum.Sad.main(Sad.scala)
    at dum.ScalaRunner.main(ScalaRunner.java:7)
Caused by: java.lang.ClassNotFoundException: org.neo4j.scala.Neo4jWrapper
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    ... 14 more

It works completely fine when I run the project from Eclipse. But, while running the jar file which I extracted from the project I get the Exception above. Where did i go wrong?

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1 回答 1

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看来您没有正确设置类路径。尝试这个：

scala -cp ./where/is/Neo4jWrapper/jar YourClass

当然，替换./where/is/Neo4jWrapper/jar为 .jar 的路径。请注意，如果您需要指向多个 jar 或类目录，则需要:在 Linux/Mac 或;Windows 中使用 if 分隔它们。并避免类路径中的空格。

于 2013-05-21T19:12:51.400 回答