异常信息: log4j:ERROR setFile(null,true) call failed. java.io.FileNotFoundException: at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:221) at java.io.FileOutputStream.<init>(FileOutputStream.java:142) at org.apache.log4j.FileAppender.setFile(FileAppender.java:311) at org.apache.log4j.RollingFileAppender.setFile(RollingFileAppender.java:207) at org.apache.log4j.FileAppender.activateOptions(FileAppender.java:182) at org.apache.log4j.config.PropertySetter.activate(PropertySetter.java:307) at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:172) at org.apache.log4j.config.PropertySetter.setProperties(PropertySetter.java:104) at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:842) at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:768) at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:648) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:514) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:580) at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526) at org.apache.log4j.LogManager.<clinit>(LogManager.java:127) at org.apache.log4j.Logger.getLogger(Logger.java:117) at log4j.LogMoreFile.<clinit>(LogMoreFile.java:11) 经过查看源码,异常产生于: void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize) throws IOException { LogLog.debug("setFile called: "+fileName+", "+append); // It does not make sense to have immediate flush and bufferedIO. if(bufferedIO) { setImmediateFlush(false); } reset(); FileOutputStream ostream = null; try { // // attempt to create file // ostream = new FileOutputStream(fileName, append); } catch(FileNotFoundException ex) { // // if parent directory does not exist then // attempt to create it and try to create file // see bug 9150 // String parentName = new File(fileName).getParent(); if (parentName != null) { File parentDir = new File(parentName); if(!parentDir.exists() && parentDir.mkdirs()) { ostream = new FileOutputStream(fileName, append); } else { throw ex; } } else { throw ex; } 发现此处有个bug 经过查看官方: