Question

我在Birt（4.4.0）中创建了脚本数据集以及事件处理程序：

public class ActionsPerDateDataSet extends ScriptedDataSetEventAdapter {    

    @Override
    public boolean fetch( IDataSetInstance dataSet, IUpdatableDataSetRow row ) throws ScriptException {
    }

    @Override
    public void open(IDataSetInstance dataSet) {
    }
}

我使用以下代码生成报告：

public File actionPdf() throws EngineException, IOException {
    IReportEngine engine = getEngine();

    IReportRunnable design = engine.openReportDesign("c:\\...\\scripted.rptdesign");

    IRunAndRenderTask task = engine.createRunAndRenderTask(design);

    //      Set parent classloader for engine
    task.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY, ReportingService.class.getClassLoader());      

    File f = new File(System.nanoTime() + "res.pdf");
    final IRenderOption options = new RenderOption();
    options.setOutputFormat("pdf");    
    OutputStream os = new FileOutputStream(f);
    options.setOutputStream(os);
    task.setRenderOption(options);
    task.run();
    task.close();
    os.close();
    return f;
}

然而Birt找不到课程：

Caused by: java.lang.ClassNotFoundException: com.foo.aip.ejb.reporting.action.ActionsPerDateDataSet
    at org.eclipse.birt.core.framework.URLClassLoader.findClass1(URLClassLoader.java:188)
    at org.eclipse.birt.core.framework.URLClassLoader$1.run(URLClassLoader.java:156)
    at org.eclipse.birt.core.framework.URLClassLoader$1.run(URLClassLoader.java:1)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.birt.core.framework.URLClassLoader.findClass(URLClassLoader.java:151)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at org.eclipse.birt.report.engine.executor.ApplicationClassLoader.loadClass(ApplicationClassLoader.java:79)
    at org.eclipse.birt.report.engine.executor.EventHandlerManager.loadClass(EventHandlerManager.java:99)
    ... 85 more

我没有想法:( 你有什么提示吗？

Answer 1

应该在初始化引擎时设置类加载器，使用org.eclipse.birt.report.engine.api.EngineConfig类型的对象

EngineConfig config = new EngineConfig();
config.getAppContext().put(EngineConstants.APPCONTEXT_CLASSLOADER_KEY,ReportingService.class.getClassLoader());

当然，只有当“ReportingService”类与“ActionsPerDateDataSet”位于同一个类加载器中但您没有提供有关该类的信息时，这才有效。如果不是这种情况，请使用

为BIRT引擎设置另一个类加载器

config.setProperty( EngineConstants.WEBAPP_CLASSPATH_KEY,"c:/your-jar-location/actionperdataset.jar;c:/your-class-location" );

Eclipse Birt ClassNotFoundException

1 个答案: