我使用j2sdk1.4.1_01 beta版本出现以下错误怎么回事，我用weblogic自带的jdk没问题！

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org.apache.jasper.JasperException: Unable to compile class for JSPerror: Invalid class file format in C:\j2sdk1.4.1_01\jre\lib\rt.jar(java/io/File.class). The major.minor version '48.0' is too recent for this tool to understand.