错误信息：
Unable to process Jar entry [COM/ibm/db2os390/sqlj/custom/DB2SQLJCustomizer.class] from Jar
[jar:file:/E:/DEVELOPER/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp3/wtpwebapps/nwprj_v2/WEB-INF/lib/db2jcc.jar!/] for annotations
org.apache.tomcat.util.bcel.classfile.ClassFormatException: null is not a Java .class file
解决办法：
打开tomcat\conf\catalina.properties文件
tomcat.util.scan.DefaultJarScanner.jarsToSkip节点增加db2jcc.jar
然后重新启动tomcat，问题解决。