[Answer]
Code is too big.
If you divide program and make code smaller, the error will not occur.
Moreover, method can not be defined on JSP.
For detail specification, please refer to the URL below and the section, “4.7.3. The Code Attribute” - “code_length”.
https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.3
Handling method is as follows;
・Review screen design and divide the screen to make one JSP smaller
・Use such as HelperBean and make java logic to java source
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iAP/Accel Platform/All Updates
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FAQID:227