TOMCAT5.5每次更新.class文件后总报错，怎么解决？

Question

附控制台报错内容如下：
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)
        at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.ManagerBase.init(ManagerBase.java:723)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:618)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)
        at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:629)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)

Answer 1

at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)
        at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:632)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)
        at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:336)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:320)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:636)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)

Answer 2

at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:346)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:320)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:636)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)
        at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.jav
a:56)
        at org.apache.log4j.PatternLayout.format(PatternLayout.java:495)
        at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:292)
        at org.apache.log4j.RollingFileAppender.subAppend(RollingFileAppender.ja
va:225)
        at org.apache.log4j.WriterAppender.append(WriterAppender.java:150)
        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:221)        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders
(AppenderAttachableImpl.java:57)
        at org.apache.log4j.Category.callAppenders(Category.java:187)
        at org.apache.log4j.Category.forcedLog(Category.java:372)
        at org.apache.log4j.Category.log(Category.java:864)
        at org.apache.commons.logging.impl.Log4JLogger.debug(Log4JLogger.java:13
7)
        at org.apache.catalina.session.StandardManager.doLoad(StandardManager.ja
va:360)
        at org.apache.catalina.session.StandardManager.load(StandardManager.java
:320)
        at org.apache.catalina.session.StandardManager.start(StandardManager.jav
a:636)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
161)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:
3024)
        at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoade
r.java:432)
        at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBas
e.java:1277)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1569)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.p
rocessChildren(ContainerBase.java:1578)
        at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.r
un(ContainerBase.java:1558)
        at java.lang.Thread.run(Thread.java:595)
log4j:ERROR Error occured while converting date.
java.lang.NullPointerException
        at java.lang.System.arraycopy(Native Method)
        at java.lang.AbstractStringBuilder.getChars(AbstractStringBuilder.java:3
31)
        at java.lang.StringBuffer.getChars(StringBuffer.java:202)
        at org.apache.log4j.helpers.ISO8601DateFormat.format(ISO8601DateFormat.j
ava:120)
        at java.text.DateFormat.format(DateFormat.java:314)
        at org.apache.log4j.helpers.PatternParser$DatePatternConverter.convert(P
atternParser.java:436)

Answer 3

应该是你的log4j配置的问题，堆栈内容都是关于log4j的，自己查看配置文件吧。或者早一个正确的配置参照一下。

Answer 4

改了下，现在是这样的异常信息
严重: Error reading tld listeners java.lang.NullPointerException
java.lang.NullPointerException
at org.apache.log4j.Category.isEnabledFor(Category.java:746)
at org.apache.commons.logging.impl.Log4JLogger.isTraceEnabled(Log4JLogger.java:327)
at org.apache.catalina.startup.TldConfig.tldScanResourcePaths(TldConfig.java:582)
at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:283)
at org.apache.catalina.core.StandardContext.processTlds(StandardContext.java:4307)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4144)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:3025)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:432)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1278)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1570)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1579)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1559)
at java.lang.Thread.run(Thread.java:595)

Answer 5

更新class以后重启一下就好了

Answer 6

给log4j文件办成log4j.category.org.zblog=ERROR,A1，给debug去掉就好了