Jbpm4-based Web project JSP page publishing Error

Core tips:
Have different class objects for the Type javax/El/expressionfactory used in the signature

 

Detailed error:

Exception javax. servlet. servletexception: 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/onduty/wfmanage_jsp, and the class
Loader (instance of org/Apache/Catalina/loader/standardclassloader)
Resolved class, javax/servlet/JSP/jspapplicationcontext, have different
Class objects for the Type javax/El/expressionfactory used in
Signature
Org. Apache. Jasper. servlet. jspservlet. Service (jspservlet. Java: 275)
Javax. servlet. http. httpservlet. Service (httpservlet. Java: 717)

 

Root Cause 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/onduty/wfmanage_jsp, and the class
Loader (instance of org/Apache/Catalina/loader/standardclassloader)
Resolved class, javax/servlet/JSP/jspapplicationcontext, have different
Class objects for the Type javax/El/expressionfactory used in
Signature
Org. Apache. jsp. onduty. wfmanage_jsp. _ jspinit (wfmanage_jsp.java: 27)
Org. Apache. Jasper. runtime. httpjspbase. INIT (httpjspbase. Java: 52)
Org. Apache. Jasper. servlet. jspservletwrapper. getservlet (jspservletwrapper. Java: 159)
Org. Apache. Jasper. servlet. jspservletwrapper. Service (jspservletwrapper. Java: 329)
Org. Apache. Jasper. servlet. jspservlet. servicejspfile (jspservlet. Java: 342)
Org. Apache. Jasper. servlet. jspservlet. Service (jspservlet. Java: 267)
Javax. servlet. http. httpservlet. Service (httpservlet. Java: 717)

 

The reason is that the three jar packages (juel. jar, WEB-INF,
Juel-impl.jar) and tomcat6 lib jar package (el-api.jar) conflict solution: Method 1: change to tomcat5.5
No problem at all. Method 2: Set juel. jar, juel-engine.jar,
Juel-impl.jar of these three packages to the Tomcat 6 Lib, and delete the original el-api.jar, remember to put the WEB-INF/lib in
Juel. jar, juel-engine.jar, juel-impl.jar Delete. Otherwise, conflict is still required.