2010.5.27记（jbpm4.3部署问题,java中的spilt方法）

招商项目需要引进一个工作流，最近在往上调研开源的工作流引擎，总结比较流行一共有3个。
其中一个是osworkflow，但是由于很长时间不再更新，所以选择放弃。另外一个就是jbmp4.3，开了很多的资料还有视频，发现其中很多东西理解困难，还有一个问题就是它的持久层是hibernate做的，本想先前想用ibatis的。估计要是真的引进工作流的话，这一块需要改了。
在研究jbpm的时候有个问题就是用tomcat部署的时候，会出现以下的错误：
严重: Servlet.service() for servlet jsp threw exception
java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/index_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature
    at org.apache.jsp.index_jsp._jspInit(index_jsp.java:24)
    at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
    at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at o