How to handle empty string

Hi
i have some 4 text fields in one jsp ,and i wanted to pass some strings to the other jsp ,if i fill only 2 text field then at the other page (after submitting) it gives error as empty string ,i want to handle this error

i am giving the part of error page ,here in this case i am not at all filling 2 text fields ,due to which i am getting the error
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: empty String
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java(Compiled Code))
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java(Compiled ................................................
root cause
java.lang.NumberFormatException: empty String
     at java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java(Compiled Code))
     at java.lang.Float.parseFloat(Float.java(Compiled Code))
     at org.apache.jsp.save_bps_jsp._jspService(save_bps_jsp.java:72)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)

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