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我使用velocity作为Java代码生成器,我正在运行一个Eclipse应用程序,它有多个插件,并且不同的插件正在调用Velocity模块来生成代码。
每当我运行一个特定的插件时,无论我运行多少次,它都能正常工作,现在,如果我尝试运行其他插件,它会抛出速度异常(我在下面提供了堆栈跟踪),我将重新启动 Eclipse再次,其他插件将正常工作。
结论:当一个插件在某个插件已经执行后运行时,Velocity 初始化失败
我使用的代码
velocityEngine = new VelocityEngine();
velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, LOCATION);
velocityEngine.setProperty(RESOURCE_LOADER,ClasspathResourceLoader.class.getName());
try {
velocityEngine.init();
} catch (Exception e) {
LOG.error("Failed to load velocity templates e={}", e);
}
我读到这是由于无法创建velocity.log文件引起的,然后我像这样尝试了
velocityEngine = new VelocityEngine();
velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "class,file");
velocityEngine.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM_CLASS, "org.apache.velocity.runtime.log.Log4JLogChute");
velocityEngine.setProperty("runtime.log.logsystem.log4j.logger", "VELLOGGER");
velocityEngine.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
velocityEngine.setProperty("runtime.log.logsystem.class", "org.apache.velocity.runtime.log.NullLogSystem");
/*
velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, LOCATION);
velocityEngine.setProperty(RESOURCE_LOADER,ClasspathResourceLoader.class.getName());
*/
try{
LOG.debug("Velocity Initialisation In AbstractFactory");
velocityEngine.init();
LOG.debug("Velocity Initialisation Done!!!");
}catch(Exception e){
LOG.error("Error Occured In Initialising Velocity Engine {}",e);
}
获取时仍然失败
template = velocityEngine.getTemplate(COMMAND_TEMPLATE_LOCATION.concat(command).concat(TEMPLATE_EXTENSION));
带有异常堆栈跟踪:
org.apache.velocity.exception.VelocityException: Error initializing log: Failed to initialize an instance of org.apache.velocity.runtime.log.NullLogSystem with the current runtime configuration.
at org.apache.velocity.runtime.RuntimeInstance.initializeLog(RuntimeInstance.java:875)
at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:262)
at org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:93)
at com.yodlee.dap.cortex.generation.engine.AbstractTemplateFactory.<init>(AbstractTemplateFactory.java:68)
at com.yodlee.dap.cortex.generation.engine.GenericTemplateFactory.<init>(GenericTemplateFactory.java:26)
at com.yodlee.dap.cortex.generation.generator.CodeGenerator.generateCode(CodeGenerator.java:52)
at com.yodlee.dap.cortex.codegenerator.processor.CodeGenProcessor.process(CodeGenProcessor.java:75)
at com.yodlee.dap.cortex.codegenerator.handler.CortexHandler.handle(CortexHandler.java:80)
at com.yodlee.dap.cortex.codegenerator.handler.CortexHandler.handle(CortexHandler.java:48)
at com.yodlee.dap.cortex.codegenerator.generate.CodeGenHandler.generate(CodeGenHandler.java:23)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.writeJavaFile(TemplateGenerator.java:228)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.findNewStates(TemplateGenerator.java:291)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.codeParser(TemplateGenerator.java:137)
at com.yodlee.eclipse.json.site.flow.CodeGenerator.generate(CodeGenerator.java:24)
at com.yodlee.eclipse.json.editor.JsonEditor.addBrowserContent(JsonEditor.java:310)
at com.yodlee.eclipse.json.editor.JsonEditor.setJsonInput(JsonEditor.java:450)
at com.yodlee.eclipse.json.editor.JsonReconcileStrategy$1.run(JsonReconcileStrategy.java:66)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4211)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3827)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
at org.eclipse.equinox.launcher.Main.main(Main.java:1492)
Caused by: org.apache.velocity.exception.VelocityException: Failed to initialize an instance of org.apache.velocity.runtime.log.NullLogSystem with the current runtime configuration.
at org.apache.velocity.runtime.log.LogManager.createLogChute(LogManager.java:220)
at org.apache.velocity.runtime.log.LogManager.updateLog(LogManager.java:269)
at org.apache.velocity.runtime.RuntimeInstance.initializeLog(RuntimeInstance.java:871)
... 42 common frames omitted
Caused by: org.apache.velocity.exception.VelocityException: The specified logger class org.apache.velocity.runtime.log.NullLogSystem does not implement the org.apache.velocity.runtime.log.LogChute interface.
at org.apache.velocity.runtime.log.LogManager.createLogChute(LogManager.java:181)
... 44 common frames omitted
12:32:52.177 [main] DEBUG com.yodlee.dap.cortex.generation.engine.GenericTemplateFactory - Start getGenericTemplate For= GenericClass
12:32:52.180 [main] ERROR com.yodlee.dap.cortex.generation.engine.GenericTemplateFactory - Error Occured In Velocity initialisation Module {}
org.apache.velocity.exception.VelocityException: Error initializing log: Failed to initialize an instance of org.apache.velocity.runtime.log.CommonsLogLogChute with the current runtime configuration.
at org.apache.velocity.runtime.RuntimeInstance.initializeLog(RuntimeInstance.java:875)
at org.apache.velocity.runtime.RuntimeInstance.init(RuntimeInstance.java:262)
at org.apache.velocity.app.VelocityEngine.init(VelocityEngine.java:93)
at com.yodlee.dap.cortex.generation.engine.GenericTemplateFactory.getGenericTemplate(GenericTemplateFactory.java:43)
at com.yodlee.dap.cortex.generation.generator.CodeGenerator.generateCode(CodeGenerator.java:52)
at com.yodlee.dap.cortex.codegenerator.processor.CodeGenProcessor.process(CodeGenProcessor.java:75)
at com.yodlee.dap.cortex.codegenerator.handler.CortexHandler.handle(CortexHandler.java:80)
at com.yodlee.dap.cortex.codegenerator.handler.CortexHandler.handle(CortexHandler.java:48)
at com.yodlee.dap.cortex.codegenerator.generate.CodeGenHandler.generate(CodeGenHandler.java:23)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.writeJavaFile(TemplateGenerator.java:228)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.findNewStates(TemplateGenerator.java:291)
at com.yodlee.eclipse.json.template.generator.code.TemplateGenerator.codeParser(TemplateGenerator.java:137)
at com.yodlee.eclipse.json.site.flow.CodeGenerator.generate(CodeGenerator.java:24)
at com.yodlee.eclipse.json.editor.JsonEditor.addBrowserContent(JsonEditor.java:310)
at com.yodlee.eclipse.json.editor.JsonEditor.setJsonInput(JsonEditor.java:450)
at com.yodlee.eclipse.json.editor.JsonReconcileStrategy$1.run(JsonReconcileStrategy.java:66)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4211)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3827)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
at org.eclipse.equinox.launcher.Main.main(Main.java:1492)
Caused by: org.apache.velocity.exception.VelocityException: Failed to initialize an instance of org.apache.velocity.runtime.log.CommonsLogLogChute with the current runtime configuration.
at org.apache.velocity.runtime.log.LogManager.createLogChute(LogManager.java:220)
at org.apache.velocity.runtime.log.LogManager.updateLog(LogManager.java:269)
at org.apache.velocity.runtime.RuntimeInstance.initializeLog(RuntimeInstance.java:871)
... 41 common frames omitted
Caused by: org.apache.velocity.exception.VelocityException: The specified logger class org.apache.velocity.runtime.log.CommonsLogLogChute does not implement the org.apache.velocity.runtime.log.LogChute interface.
at org.apache.velocity.runtime.log.LogManager.createLogChute(LogManager.java:181)
... 43 common frames omitted
最佳答案
后来我找到了问题的真正根源。每当一个插件初始化速度时,另一个插件就无法重新初始化它,因为运行时环境是相同的。此外,两者都作为单独的模块存在,因此由于范围问题而无法访问它,因此速度初始化失败。
我们实现的解决方案是将两个插件集中在单个模块下,因此一个模块中的初始化类可以被其他模块访问。
关于apache - 速度初始化失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45006042/
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