配置开发环境(JDK1.5+Tomcat5.5.4+Eclipse3.1)时碰到的3个问

王朝java/jsp·作者佚名  2008-05-31
窄屏简体版  字體: |||超大  

我在配置开发环境(JDK1.5+Tomcat5.5.4+Eclipse3.1)时碰到的3个问

1、问题:用打开带Java小程序的页面,在Java小程序的地方显示一灰色区块,

当鼠标移动到该区块时,状态栏提示:

load:class XXXXX not found

解答:参考http://www.cryer.co.uk/brian/java/help_classnotfound.htm

2、问题:在Eclipse中执行,报Could not find the main class.Program will exit.

console窗口:

java.lang.ExceptionInInitializerError

Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException))

at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)

at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)

at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)

at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)

at org.apache.catalina.startup.Bootstrap.<clinit>(Bootstrap.java:53)

Caused by: org.apache.commons.logging.LogConfigurationException: java.lang.NullPointerException (Caused by java.lang.NullPointerException)

at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstrUCtor(LogFactoryImpl.java:397)

at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)

... 4 more

Caused by: java.lang.NullPointerException

at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:374)

... 5 more

Exception in thread "main"

解答:

Possible solution:

I edited the file "tomcat50x.server" under

C:\eclipse\plugins\com.objectlearn.jdt.j2ee_3.0.1\servers

and changed

-Djava.endorsed.dirs="${serverRootDirectory}/bin;${serverRootDirectory}/common/endorsed"

to

-Djava.endorsed.dirs="${serverRootDirectory}/common/endorsed"

in the following ´tags´:

<startVmParameters>-DJAVA_HOME="${jrePath}" -Dcatalina.base="${serverRootDirectory}" -Dcatalina.home="${serverRootDirectory}" -Djava.io.tmpdir="${serverRootDirectory}/temp" -Djava.endorsed.dirs="${serverRootDirectory}/bin;${serverRootDirectory}/common/endorsed"</startVmParameters>

and

<stopVmParameters>-DJAVA_HOME="${jrePath}" -Dcatalina.base="${serverRootDirectory}" -Dcatalina.home="${serverRootDirectory}" -Djava.io.tmpdir="${serverRootDirectory}/temp" -Djava.endorsed.dirs="${serverRootDirectory}/bin;${serverRootDirectory}/common/endorsed"</stopVmParameters>

 
 
 
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