java - HTTP Status 500 - An exception occurred processing JSP page /FinancialAssessment.jsp at line 440 -

java - HTTP Status 500 - An exception occurred processing JSP page /FinancialAssessment.jsp at line 440 -

following exact error.

type exception report:

message exception occurred processing jsp page /financialassessment.jsp @ line 440

description:

the server encountered internal error prevented fulfilling request.

exception:

org.apache.jasper.jasperexception: exception occurred processing jsp page /financialassessment.jsp @ line 440 437: 438: 439: 440: if(std.prev_treatment_start_date.equals("null")) 441: { 442: system.out.println("out krishna------------"); 443:

stacktrace:

org.apache.jasper.servlet.jspservletwrapper.handlejspexception(jspservletwrapper.java:568) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:470) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728)

root cause:

java.lang.nullpointerexception org.apache.jsp.financialassessment_jsp._jspservice(financialassessment_jsp.java:542) org.apache.jasper.runtime.httpjspbase.service(httpjspbase.java:70) javax.servlet.http.httpservlet.service(httpservlet.java:728) org.apache.jasper.servlet.jspservletwrapper.service(jspservletwrapper.java:432) org.apache.jasper.servlet.jspservlet.servicejspfile(jspservlet.java:390) org.apache.jasper.servlet.jspservlet.service(jspservlet.java:334) javax.servlet.http.httpservlet.service(httpservlet.java:728)

if error line 1 on if statement prabably, seek this:

if( std == null || std.prev_treatment_start_date == null ) { .....

this because in java have test each object avoid nullpointerexception means object null , cannot have methods or attributes.

java jsp servlets