LO49880: MEMORY LEAK IN JAVA AGENT WITH ATTACHED JAR FILE

APAR status

• Closed as program error.

Error description

• 1.  Create a new java agent.
  2.  Place the following code in the agent:
  
  import java.sql.*;
  import java.util.*;
  import lotus.domino.*;
  import com.ibm.as400.access.AS400JDBCDriver;
  
  public class JavaAgent extends AgentBase {
  public void NotesMain() {
  
   try {
  
    DriverManager.registerDriver(new AS400JDBCDriver());
   }
   catch (Exception e) {
    System.out.println (e);
    e.printStackTrace(System.out);
   }
   finally {
    try {
     for (Enumeration e = DriverManager.getDrivers();
  e.hasMoreElements();) {
            Driver driver = (Driver) e.nextElement();
            if (driver.getClass().getClassLoader() ==
  getClass().getClassLoader()) {
              DriverManager.deregisterDriver(driver);
            }
          }
     System.runFinalization();
     System.gc();
    }
    catch (Exception e) {
     System.out.println (e);
     e.printStackTrace(System.out);
    }
   }
  }
  }
  
  3.  Attach as400.jar to the Java project in the agent.
  4.  Compile and save the agent.
  5.  Run the agent several times until the Java heap runs out of
  memory.
  
  Memory analysis on a heap dump at this point will show several
  entries like the
  following:
  
  The classloader/component "lotus.domino.AgentLoader @ 0xa581c70"
  occupies
  10,062,064 (15.35%) bytes. The memory is accumulated in one
  instance of
  "java.util.Hashtable$Entry[]" loaded by
  "com.ibm.oti.vm.BootstrapClassLoader @
  0x9e30828".
  

Local fix

• Remove the JAR file from the project of the Java Agent and place
  it in the
  jvm/lib/ext folder.
  

Problem summary

• A programming error was found and will be corrected in a future
   release.
  

Problem conclusion

• A programming error was found and will be corrected in a future
   release.
  

Temporary fix

Comments

• This APAR is associated with SPR# MCOA8C7CNX.
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DOMINO SERVER

• Fixed component ID

  5724E6200

Applicable component levels

• R850 PSN

     UP