Question

我正试图在插件项目中添加Log4j.jar以进行日志记录。我通过使用构建路径->添加外部jar添加了log4j jar。之后，我尝试运行插件项目，但出现错误

java.lang.NoClassDefFoundError：org / apache / log4j / PropertyConfigurator。

如果我使用java main方法运行相同的代码，它将正常工作。

public HHLogger(Object className) {
    DateTimeFormatter df  = DateTimeFormatter.ofPattern("ddMMYYYY");
    System.setProperty("filename", df.format(LocalDate.now()));
    PropertyConfigurator.configure(".\\resources\\log4j.properties");
    logger = Logger.getLogger(className.getClass());
}



public static void main(String args[]) {
    DateTimeFormatter df  = DateTimeFormatter.ofPattern("ddMMYYYY");
    System.setProperty("filename", df.format(LocalDate.now()));
    PropertyConfigurator.configure(".\\resources\\log4j.properties");
    logger = Logger.getLogger(HHLogger.class);
    logger.info(" 999 Welcom");

}

java.lang.NoClassDefFoundError：org / apache / log4j / PropertyConfigurator 在com.americanexpress.connecthotelforgbt.utility.HHLogger。（HHLogger.java:22）在com.americanexpress.connecthotelforgbt.parsers.OhhRqRsParser。（OhhRqRsParser.java:104）在com.americanexpress.connecthotelforgbt.DataIntelliSense.upshell命令（DataIntelliSense.java:322）在com.americanexpress.connecthotelforgbt.listener.CommandModificationService.process（CommandModificationService.java:102）在com.sabre.edge.cf.core.executors.PublicServiceExecutor.decide（PublicServiceExecutor.java:143）在org.jbpm.graph.node.Decision.execute（Decision.java:85）在org.jbpm.graph.def.Node.enter（Node.java:314）在org.jbpm.graph.def.Transition.take（Transition.java:151）在org.jbpm.graph.def.Node.leave（Node.java:389）在org.jbpm.graph.node.StartState.leave（StartState.java:70）在org.jbpm.graph.exe.Token.signal（Token.java:192）在org.jbpm.graph.exe.Token.signal（Token.java:140）在org.jbpm.graph.exe.ProcessInstance.signal（ProcessInstance.java:271）在com.sabre.edge.cf.core.flow.JBPMFlowExecutor.execute（JBPMFlowExecutor.java:45）在com.sabre.edge.cf.core.SRWRuntime.executeWorkflow（SRWRuntime.java:238）在com.sabre.edge.cf.core.SRWRuntime.process（SRWRuntime.java:173）在com.sabre.edge.cf.emu.bridge.EmulatorBridge.processServiceContext（EmulatorBridge.java:198）在com.sabre.edge.cf.emu.bridge.EmulatorBridge.updateCommand（EmulatorBridge.java:87）在com.sabre.stn.emulator.core.bridge.BridgeFilter.preSend（BridgeFilter.java:80）在com.sabre.stn.emulator.basic.model.BasicEmulatorModel.sendPreProcess（BasicEmulatorModel.java:3737）在com.sabre.stn.emulator.basic.model.BasicEmulatorModel.sendMessage（BasicEmulatorModel.java:3596）在com.sabre.stn.emulator.basic.model.BasicEmulatorModel.doEnter（BasicEmulatorModel.java:3516）在com.sabre.stn.emulator.basic.model.BasicEmulatorModel.enter（BasicEmulatorModel.java:1749）在com.sabre.stn.emulator.basic.BasicEmulator.enter（BasicEmulator.java:1979）在com.sabre.stn.emulator.core.EmuManager.emptyTheKeyBuffer（EmuManager.java:1132）在com.sabre.stn.emulator.core.KeysToScreenThread.run（KeysToScreenThread.java:78）引起原因：java.lang.ClassNotFoundException：org.apache.log4j.PropertyConfigurator 在org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal（BundleLoader.java:506）在org.eclipse.osgi.internal.loader.BundleLoader.findClass（BundleLoader.java:422）在org.eclipse.osgi.internal.loader.BundleLoader.findClass（BundleLoader.java:410）在org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass（DefaultClassLoader.java:107）在java.lang.ClassLoader.loadClass（未知来源） ...另外26个

Answer 1

该错误消息很清楚，无法找到PropertyConfigurator的类文件确保类文件PropertyConfigurator在您的类路径中，或者如果它在jar文件中，则同样适用。它表明PropertyConfigurator是在编译时找到的，而在运行时找不到的。也许您只需要将其添加到类路径中即可。

请参阅以下内容可以帮助您：How to solve java.lang.NoClassDefFoundError?

ps：如果两个类都在同一文件中，则您不能这样做，因为它们都是公共的。

尝试在插件类型项目中添加log4j。错误：java.lang.NoClassDefFoundError：org / apache / log4j / PropertyConfigurator

1 个答案: