New to Java

I know this question has been asked for many times.
But I don't know why this method doesn't work properly.



I got the following method in a JSP page:

<%!





public boolean isNumeric(String num) {

boolean isNumeric=false;

try{
Double.parseDouble(num);
isNumeric=true;
}
catch(Exception e) {}
finally{
return isNumeric;
}
}




%>

when I pass a String to this method, for example, String s=12.3; it didn't return false,instead...........


it brought me to some error messages:

exception

org.apache.jasper.JasperException: For input string: "4.7"
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:384)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
sun.reflect.GeneratedMethodAccessor131.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:324)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)


root cause

java.lang.NumberFormatException: For input string: "4.7"
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:477)
java.lang.Integer.parseInt(Integer.java:518)
org.apache.jsp.addcdvalidation_jsp._jspService(addcdvalidation_jsp.java:126)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:105)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:336)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
sun.reflect.GeneratedMethodAccessor131.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:324)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:500)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)








I don't want it to return these error messages, I want it to return false if the passed String cannot be converted to an integer.


How to resolve this problem?

many thanks to you all.