[解决]java.lang.IllegalArgumentException: Bad level "DEBUG"

　　Tomcat启动报错,搞得烦的一比。常规思维就会迷瞪，谁让tomcat的日志级别特殊ne....

http://tomcat.apache.org/tomcat-7.0-doc/

错误现象：

Handler error
java.lang.IllegalArgumentException: Bad level "DEBUG"
    at java.util.logging.Level.parse(Level.java:)
    at org.apache.juli.FileHandler.configure(FileHandler.java:)
    at org.apache.juli.FileHandler.<init>(FileHandler.java:)
    at org.apache.juli.FileHandler.<init>(FileHandler.java:)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:)
    at java.lang.Class.newInstance(Class.java:)
    at org.apache.juli.ClassLoaderLogManager.readConfiguration(ClassLoaderLogManager.java:)
    at org.apache.juli.ClassLoaderLogManager.readConfiguration(ClassLoaderLogManager.java:)
    at org.apache.juli.ClassLoaderLogManager.readConfiguration(ClassLoaderLogManager.java:)
    at java.util.logging.LogManager$.run(LogManager.java:)
    at java.util.logging.LogManager$.run(LogManager.java:)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.readPrimordialConfiguration(LogManager.java:)
    at java.util.logging.LogManager.getLogManager(LogManager.java:)
    at java.util.logging.Logger.<init>(Logger.java:)
    at java.util.logging.LogManager$RootLogger.<init>(LogManager.java:)
    at java.util.logging.LogManager$RootLogger.<init>(LogManager.java:)
    at java.util.logging.LogManager$.run(LogManager.java:)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.<clinit>(LogManager.java:)
    at java.util.logging.Logger.demandLogger(Logger.java:)
    at java.util.logging.Logger.getLogger(Logger.java:)
    at org.apache.juli.logging.DirectJDKLog.<init>(DirectJDKLog.java:)
    at org.apache.juli.logging.DirectJDKLog.getInstance(DirectJDKLog.java:)
    at org.apache.juli.logging.LogFactory.getInstance(LogFactory.java:)
    at org.apache.juli.logging.LogFactory.getInstance(LogFactory.java:)
    at org.apache.juli.logging.LogFactory.getLog(LogFactory.java:)
    at org.apache.catalina.startup.Bootstrap.<clinit>(Bootstrap.java:)

错误分析：　　

tomcat,默认的日志级别

SEVERE (highest value) > WARNING > INFO > CONFIG > FINE > FINER > FINEST (lowest value)

详情：http://www.cnblogs.com/xiaochina/p/6864043.html

解决方案：

　　修改conf/logging.properties,DEBUG替换FINE