JSP script giving blank output on HPUX

Posted on 2005-03-30
Medium Priority
Last Modified: 2010-04-01
Hi experts,

The follow code is generating a blank page while running from hp-ux (tomcat installed) :

--------------------------------------- CODE START ---------------------------------------------------------------

<%@ page language="java" import="java.io.*, java.util.*, java.lang.*" %>
<p>Testing Page</p>

StringBuffer sb = new StringBuffer();

  String cmd = "ls";

  System.out.println ("Starting the process");
  Runtime runTime = Runtime.getRuntime();
  Process process = runTime.exec(cmd);
  InputStream inputStream = process.getInputStream();
  InputStreamReader   inputStreamReader = new InputStreamReader (inputStream);
  BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
  String line = null;
  while ( (line = bufferedReader.readLine()) != null ){
        sb.append(line); sb.append("\n");
  System.out.println("Output : " + sb.toString());
  int exitVal = process.waitFor();
  System.out.println ("Process exitValue:  " + exitVal );
}catch (Throwable t)


----------------------------------------------------- CODE END --------------------------------------------------

----------------------------------------------------- OUTPUT START --------------------------------------------

Testing Page

------------------------------------------------------ OUTPUT END -----------------------------------------------

Any help?

Thanks in advance.
Question by:myrizvi
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LVL 35

Expert Comment

ID: 13662638
Is it printing the output into the log files?

You don't send anything to the screen...

    System.out.println("Output : " + sb.toString());

should probably be:

    out.println( "Output : " + sb.toString().replaceAll( "\\n", "<br>" ) );

That *might* work...

You might need to read the inputstream in a seperate thread...

Step 1:  Look in catalina.out for either output, or an exception...
LVL 29

Expert Comment

ID: 13662643
do you have the correct permissions and are you in the correct shell?

Author Comment

ID: 13662855
Hi TimYates,

Yes the output was going to  CATALINA.OUT  file.

After putting  this :

out.println( "Output : " + sb.toString() )  

Output is appearing on the webpage without newline, but with this :

out.println( "Output : " + sb.toString().replaceAll( "\\n", "<br>" ) )

Following ERROR appearing :

---------------------------------------------- ERROR OUTPUT START ------------------------------------------


org.apache.jasper.JasperException: Unable to compile class for JSP

An error occured between lines: 4 and 31 in the jsp file: /test1.jsp

Generated servlet error:
/sasgsmapp/sasgsm/mds/sas/ui/work/localhost/sas5/test1$jsp.java:80: Method replaceAll(java.lang.String, java.lang.String) not found in class java.lang.String.
                  out.println( "Output : " + sb.toString().replaceAll("\n","<br>"));
1 error

----------------------------------------------------------- END -------------------------------------------------------------

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LVL 35

Accepted Solution

TimYates earned 1000 total points
ID: 13662891
right...so you are using java 1.3?

try this:

  System.out.println( "Output :<br><pre>\n" + sb.toString() + "</pre>" );
LVL 35

Expert Comment

ID: 13662897
Or, upgrading to java 1.4 will get you the "replaceAll" function ;-)

Author Comment

ID: 13662972

Its done man :)

Many many thanks to TimYates.
LVL 35

Expert Comment

ID: 13663038

Good luck with it!!


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