Question

我在IBM Rational Rhapsody的插件类中使用Guava库中的Optional类。

当我从Rhapsody中将该类作为插件运行时，对Optional类的调用会导致＆＃34; java.lang.NoClassDefFoundError＆＃34;错误，虽然当我在我的类main方法中调用它并将我的类作为Java应用程序运行时，它工作正常。这是代码：

package com.example;

import com.google.common.base.Optional;
import com.telelogic.rhapsody.core.IRPApplication;
import com.telelogic.rhapsody.core.RPUserPlugin;
import com.telelogic.rhapsody.core.RhapsodyAppServer;

public class Test extends RPUserPlugin{

  public static void main(String[] args) {
    IRPApplication rhp = RhapsodyAppServer.getActiveRhapsodyApplication();
    Optional<IRPApplication> app = Optional.of(rhp);
    doSomething(app);
  }

  /** 
   * this is called by rhapsody
   */
  @Override
  public void RhpPluginInit(IRPApplication rpyApplication) {
    IRPApplication rhp = RhapsodyAppServer.getActiveRhapsodyApplication();
    Optional<IRPApplication> app = Optional.of(rhp);
    doSomething(app);
  }

}

Answer 1

听起来像是一个类路径问题。确保将Google代码捆绑到插件jar中或在.hep文件中创建类路径条目。我使用Scala作为我选择的语言，并在所有地方使用选项，但我确保将scala运行时捆绑到我的插件jar文件中。此外，请确保在该接口中实现其余方法。作为插件，插件的REAL动作不会发生，直到Rhapsody通过Rhapsody中的“工具”菜单启动它时调用RhpPluginInvokeItem（）方法。请参阅下面的示例：

public class Test extends RPUserPlugin{
  IRPApplication rhp=null;

  public static void main(String[] args) {
     // no optionals in my example...
     Test plugin = new Test();
     IRPApplication app = RhapsodyAppServer.getActiveRhapsodyApplication();
     if (app != null) {
       plugin.RhpPluginInit(app);
       plugin.RhpPluginInvokeItem();
     }  else System.out.println("No running Rhapsody application found.");
   }

  @Override
  public void RhpPluginInit(IRPApplication rpyApplication) {
    // Don't re-acquire the handle to the active application here, that gets
    // handed to you in the parameter above (rpyApplication)
    //IRPApplication rhp = RhapsodyAppServer.getActiveRhapsodyApplication();
    rhp = rpyApplication;
    // setup logic here...in preparation for RhpPluginInvokeItem() to be called.
  }

  @Override
  public void RhpPluginInvokeItem() {
    rhp.writeToOutputWindow("plugin","Invoking doSomething()...");
    //doSomething();
  }

  // implement the rest of the overriden methods here...
}

如果在main方法之外调用类，则为NoClassDefFoundError

1 个答案: