weblogic9下java.lang.NoClassDefFoundError问题

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在weblogic9一个域下部署3个应用,其中一个应用出现错误如下,页面错误为：java.lang 数据下载失败，其他应用正常运行。出错的应用程序启动是没有任何问题的，但运行一段时间后,木有固定时间,程序就会出现该问题,错误部分已经加粗。

ERROR:2012-05-02 07:24:44,681 -
java.lang.NoClassDefFoundError
at com.jsjn.lois.req.dao.impl.LoiRegDAOImpl.getCount(LoiRegDAOImpl.java:57)
at com.jsjn.lois.req.service.impl.LoiRegServiceImpl.getCount(LoiRegServiceImpl.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy92.getCount(Unknown Source)
at com.jsjn.lois.req.dorado.listener.LoiRegView_dsRegQueryListener.afterLoadData(LoiRegView_dsRegQueryListener.java:111)
at com.bstek.dorado.data.DatasetSupport.fireAfterLoadData(DatasetSupport.java:2048)
at com.bstek.dorado.data.DatasetSupport.internalLoad(DatasetSupport.java:928)
at com.bstek.dorado.view.data.ViewDatasetSupport.internalLoad(ViewDatasetSupport.java:614)
at com.bstek.dorado.view.data.AbstractViewDataset.internalLoad(AbstractViewDataset.java:32)
at com.bstek.dorado.data.DatasetSupport.load(DatasetSupport.java:877)
at com.bstek.dorado.view.ViewModelSupport.doLoadData(ViewModelSupport.java:628)
at com.bstek.dorado.view.ViewModelSupport.doLoadData(ViewModelSupport.java:615)
at com.bstek.dorado.view.ViewModelSupport.prepareDatasets(ViewModelSupport.java:592)
at com.bstek.dorado.view.rpc.LoadDataRPCHandler.internalExecute(LoadDataRPCHandler.java:130)
at com.bstek.dorado.view.rpc.AbstractRPCHandler.execute(AbstractRPCHandler.java:119)
at com.bstek.dorado.view.smartweb.v2.ViewServiceController.doRPC(ViewServiceController.java:453)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.bstek.dorado.action.Controller.doDispatch(Controller.java:220)
at com.bstek.dorado.action.Controller.internalDispatch(Controller.java:174)
at com.bstek.dorado.action.Controller.internalDispatch(Controller.java:138)
at com.bstek.dorado.action.Controller.invokeAction(Controller.java:113)
at com.bstek.dorado.action.ActionHandler.invokeAction(ActionHandler.java:140)
at com.bstek.dorado.action.ActionHandler.invokeAction(ActionHandler.java:130)
at com.bstek.dorado.core.DoradoServlet.doGet(DoradoServlet.java:85)
at com.bstek.dorado.core.DoradoServlet.doPost(DoradoServlet.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:283)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at com.jsjn.common.filter.TimeZoneFilter.doFilter(TimeZoneFilter.java:56)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at com.bstek.dorado.core.FilterHandle.internalDoFilter(FilterHandle.java:343)
at com.bstek.dorado.core.FilterHandle.doAgentRPCFilter(FilterHandle.java:291)
at com.bstek.dorado.core.FilterHandle.doFilter(FilterHandle.java:155)
at com.bstek.dorado.core.DoradoFilter.doFilter(DoradoFilter.java:72)
at com.jsjn.lois.osys.util.RcasDoradoFilter.doFilter(RcasDoradoFilter.java:43)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:42)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3229)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2002)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:1908)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1362)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:181)
INFO:2012-05-02 07:24:51,739 - sessionFactoryName: null
WARN:2012-05-02 07:24:51,817 -
==lois==createSQLQuery--sql:SELECT TX_NO_SEQ.NEXTVAL FROM DUAL

INFO:2012-05-02 07:24:51,818 - sessionFactoryName: null
INFO:2012-05-02 07:24:54,780 - sessionFactoryName: null
INFO:2012-05-02 07:24:58,589 - sessionFactoryName: null
ERROR:2012-05-02 07:24:58,597 -
java.lang.NoClassDefFoundError

错误DAO下类的实现：

public int getCount(Map queryMap) {
  StringBuilder sql = new StringBuilder("SELECT COUNT(1) " + " FROM "
    + Constant.LOIS_DB_NAME + "LOI_REG t1 " + " LEFT JOIN "
    + Constant.LM_DB_NAME
    + "cibaseinfo t2 ON t1.PEYER_ID=t2.custno " + " LEFT JOIN "
    + Constant.LOIS_DB_NAME + "LOI_LOSS t4 ON t1.LOI_ID=t4.LOI_ID "
    + " LEFT JOIN " + Constant.LOIS_DB_NAME
    + "LOI_REQLOG t5 ON t1.APT_SEQ=t5.APT_SEQ " + " LEFT JOIN "
    + Constant.LOIS_DB_NAME
    + "LOI_REQLOG t6 ON t1.APT_SEQ=t6.APT_SEQ " + " LEFT JOIN "
    + Constant.LM_DB_NAME
    + "cibaseinfo t7 ON t6.PAYEE_ID=t7.custno " + " WHERE 1=1 ");

jdk版本为1.5 ，个人觉得问题出现在Constant 常量这个类,但是又不知道为什么错了，请高手解答，在线急等。。。

补充：常量类实现如下：

// 读取配置文件
private static final String LOIS_CONFIG = "lois_config.properties";
//读取数据库名称
public static String getDBName(String dbName) {
  PropertiesUtil pptUtil = new PropertiesUtil(LOIS_CONFIG);
  String loisDbName = ConverUtil.getObjStr(pptUtil.getValue(dbName)).concat(".");
  System.out.println("读取数据库名称："+loisDbName);
  return loisDbName;
}
public static final String LOIS_DB_NAME=Constant.getDBName("LOIS_DB_NAME");//数据库用户

常量在加载一次后,在以后的程序运行中,应该是可以直接调用的,搞不明白为什么会出现java.lang.NoClassDefFoundError////

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