为什么我的Jnlp程序不能与log4j一起使用？

I have the following problem: I've deployed in Tomcat a JNLP and an executable JAR files. JNLP file should automatically download the JAR file and execute it. The JAR file is signed and verified. This is done (the downloading part). But when to execute the JAR main class (specified in the JNLP file), a problem occurs: A part of the main class code is executed. Afterwards, when it tries to load a class that has a static final org.apache.log4j.Logger instance declared, it says an error.I have the following problem: I've deployed in