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http status 500 - string index out of range: -10

---

    type exception report

    message string index out of range: -10

    description the server encountered an internal error that prevented it from fulfilling this request.

    exception

    java.lang.stringindexoutofboundsexception: string index out of range: -10

    java.lang.string.substring

    com.lib.decryptutil.filedecrypt

    com.encrypt.action.execute

    sun.reflect.generatedmethodaccessor38.invoke

    sun.reflect.delegatingmethodaccessorimpl.invoke

    java.lang.reflect.method.invoke

    com.opensymphony.xwork2.defaultactioninvocation.invokeaction

    com.opensymphony.xwork2.defaultactioninvocation.invokeactiononly

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.interceptor.defaultworkflowinterceptor.dointercept

    com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.validator.validationinterceptor.dointercept

    org.apache.struts2.interceptor.validation.annotationvalidationinterceptor.dointercept

    com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.interceptor.conversionerrorinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.interceptor.parametersinterceptor.dointercept

    com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.interceptor.parametersinterceptor.dointercept

    com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    com.opensymphony.xwork2.interceptor.staticparametersinterceptor.intercept

    com.opensymphony.xwork2.defaultactioninvocation.invoke

    org.apache.struts2.interceptor.multiselecti