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发信人: slight (生命不息，奋斗不止), 信区: Java
标 题: 如何读懂异常发生时的信息
发信站: 荔园晨风BBS站 (Wed Nov 15 22:54:23 2006), 站内
感觉新手面对大段大段的异常信息会无所适从，
其实可以丛冢获取很有用的帮助信息。
刚好一个同事让我教他如何读这些信息，
所以帖在这里，跟大家共同学习。
/********************
*********************/
标记里是我的注释。
Connected to the target VM, address: '127.0.0.1:1266', transport: 'socket'
21:17:40,081 ERROR Configuration:296 - Could not configure datastore from input
stream
/**********************
ERROR表示这是一个错误，Configuration:296 表示这个信息在Configuration的第296行记
录下来的。
Could not configure datastore from input stream 表示的是这个错误的原因。
下面这些是导致错误所发生的异常的信息。
at
at
是一个调用堆栈，最上面的at org.dom4j.io.SAXReader.read(SAXReader.java:358)就是异
常的发生点。
connect Nested exception
表示DocumentException是一个嵌套异常，异常由另一个异常所引起。
*********************/
org.dom4j.DocumentException: Connection timed out: connect Nested exception:
Connection timed out: connect
at org.dom4j.io.SAXReader.read(SAXReader.java:358)
at
net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:287)
at
org.springframework.orm.hibernate.LocalSessionFactoryBean.afterPropertiesSet(Loc
alSessionFactoryBean.java:446)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.inv
okeInitMethods(AbstractAutowireCapableBeanFactory.java:1003)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.cre
ateBean(AbstractAutowireCapableBeanFactory.java:348)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:226)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:147)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstanti
ateSingletons(DefaultListableBeanFactory.java:269)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA
pplicationContext.java:317)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:80)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:65)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:56)
at com.test.TestDemo.testHibernate(TestDemo.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at
com.intellij.rt.execution.junit2.IdeaJUnitAgent.doRun(IdeaJUnitAgent.java:58)
at junit.textui.TestRunner.start(TestRunner.java:172)
at
com.intellij.rt.execution.junit.TextTestRunner2.startRunnerWithArgs(TextTestRunn
er2.java:23)
at
com.intellij.rt.execution.junit2.JUnitStarter.prepareStreamsAndStart(JUnitStarte
r.java:98)
at
com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:32)
/****************
注意到下面的Nested exception，
真正说明了DocumentException是一个嵌套异常，上面的异常是有下面的异常引起
异常信息是:java.net.ConnectException: Connection timed out: connect
******************/
Nested exception:
java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:507)
at java.net.Socket.connect(Socket.java:457)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:365)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:477)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:214)
at sun.net.www.http.HttpClient.New(HttpClient.java:287)
at sun.net.www.http.HttpClient.New(HttpClient.java:299)
at
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.j
ava:792)
at
sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:
744)
at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:669)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.jav
a:913)
/***********************
注意这几行，说明xml在处理dtd时使用http去连网络，但是网络不通。
但是注意这里，我们没办法知道到底连了什么网络地址。
如何知道呢？这需要靠写程序的人注意，他可以尝试connection异常，
然后做下error日志，然后还是抛出该connection异常，
这样我们就可以清楚知道了。这也算是写程序的小技巧了。
我想想，上面的办法也不好，会淹没了堆栈的实际信息。
还是在连接网络前，自己做下info级别的日志好，呵呵。
************************/
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLE
ntityManager.java:973)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityMa
nager.java:905)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntit
yManager.java:872)
at
com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDS
cannerImpl.java:282)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDispatcher.dis
patch(XMLDocumentScannerImpl.java:1021)
at
com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocum
ent(XMLDocumentFragmentScannerImpl.java:368)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configu
ration.java:834)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configu
ration.java:764)
at
com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
at
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXPa
rser.java:1242)
at org.dom4j.io.SAXReader.read(SAXReader.java:339)
at
net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:287)
at
org.springframework.orm.hibernate.LocalSessionFactoryBean.afterPropertiesSet(Loc
alSessionFactoryBean.java:446)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.inv
okeInitMethods(AbstractAutowireCapableBeanFactory.java:1003)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.cre
ateBean(AbstractAutowireCapableBeanFactory.java:348)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:226)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:147)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstanti
ateSingletons(DefaultListableBeanFactory.java:269)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA
pplicationContext.java:317)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:80)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:65)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:56)
at com.test.TestDemo.testHibernate(TestDemo.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.textui.TestRunner.doRun(TestRunner.java:116)
at
com.intellij.rt.execution.junit2.IdeaJUnitAgent.doRun(IdeaJUnitAgent.java:58)
at junit.textui.TestRunner.start(TestRunner.java:172)
at
com.intellij.rt.execution.junit.TextTestRunner2.startRunnerWithArgs(TextTestRunn
er2.java:23)
at
com.intellij.rt.execution.junit2.JUnitStarter.prepareStreamsAndStart(JUnitStarte
r.java:98)
at
com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:32)
/***********************
这段是由于上面的工作失败，导致总的工作失败，所以总的工作也报了这个错误。
************************/
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'sessionFactory' defined in class path resource
[hibernate-Context.xml]: Initialization of bean failed; nested exception is
net.sf.hibernate.MappingException: org.dom4j.DocumentException: Connection
timed out: connect Nested exception: Connection timed out: connect
net.sf.hibernate.MappingException: org.dom4j.DocumentException: Connection
timed out: connect Nested exception: Connection timed out: connect
at
net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:297)
at
org.springframework.orm.hibernate.LocalSessionFactoryBean.afterPropertiesSet(Loc
alSessionFactoryBean.java:446)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.inv
okeInitMethods(AbstractAutowireCapableBeanFactory.java:1003)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.cre
ateBean(AbstractAutowireCapableBeanFactory.java:348)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:226)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:147)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstanti
ateSingletons(DefaultListableBeanFactory.java:269)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA
pplicationContext.java:317)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:80)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:65)
at
org.springframework.context.support.ClassPathXmlApplicationContext.<init>
(ClassPathXmlApplicationContext.java:56)
at com.test.TestDemo.testHibernate(TestDemo.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav
a:25)
at
com.intellij.rt.execution.junit2.JUnitStarter.main(JUnitStarter.java:32)
Caused by: org.dom4j.DocumentException: Connection timed out: connect Nested
exception: Connection timed out: connect
at org.dom4j.io.SAXReader.read(SAXReader.java:358)
at
net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:287)
... 29 more
Disconnected from the target VM, address: '127.0.0.1:1266', transport: 'socket'
Process finished with exit co
de -1
--
"尽管外表完整快活。但灵魂中已留下某些创伤"
哈哈，这是一句爱因斯坦形容莫扎特的话，两位最美妙的天才，简直cool
※ 修改:·slight 于 Nov 15 23:19:30 修改本文·[FROM: 59.40.163.219]
※ 来源:·荔园晨风BBS站 bbs.szu.edu.cn·[FROM: 59.40.163.219]
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