Weblogic server diagnostic image

Take diagnostic image

 unzip -l diagnostic_image_AdminServer_2010_11_27_12_44_12.zip 
Archive:  diagnostic_image_AdminServer_2010_11_27_12_44_12.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
     4440  11-27-2010 12:44   JTA.img
      161  11-27-2010 12:44   WatchSource.img
     6298  11-27-2010 12:44   configuration.img
     3369  11-27-2010 12:44   WORK_MANAGER.img
    11619  11-27-2010 12:44   JNDI_IMAGE_SOURCE.img
   215601  11-27-2010 12:44   APPLICATION.img
      181  11-27-2010 12:44   InstrumentationImageSource.img
      586  11-27-2010 12:44   SAF.img
   368637  11-27-2010 12:44   Logging.img
    12372  11-27-2010 12:44   PERSISTENT_STORE.img
    27011  11-27-2010 12:44   JDBC.img
       66  11-27-2010 12:44   PathService.img
      429  11-27-2010 12:44   JMS.img
     6154  11-27-2010 12:44   Deployment.img
    34792  11-27-2010 12:44   JVM.img
      223  11-27-2010 12:44   CONNECTOR.img
    29455  11-27-2010 12:44   image.summary
---------                     -------
   721394                     17 files

JDBC.img

more JDBC.img 
Dumping Resource Pool:XE
Resource Pool:XE:dumpPool Current Capacity = 15
Resource Pool:XE:dumpPool dumping available resources, #entries = 0
Resource Pool:XE:dumpPool dumping reserved resources, #entries = 15
Resource Pool:XE:dumpPool reserved[0] = autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=true,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTi
me=126,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290858199133,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)
,currentThread=Thread[Thread-131,5,Pooled Threads],lastUser=null,currentError=null,currentErrorTimestamp=null,JDBC4Runtime=true,supportStatementPoolable=true,needRestoreClientInfo=false,defaultClientInf
o={},supportIsValid=true
Resource Pool:XE:dumpPool reserved[1] = autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=true,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTi
me=219,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290858199286,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)
,currentThread=Thread[Thread-128,5,Pooled Threads],lastUser=null,currentError=null,currentErrorTimestamp=null,JDBC4Runtime=true,supportStatementPoolable=true,needRestoreClientInfo=false,defaultClientInf
o={},supportIsValid=true
Resource Pool:XE:dumpPool reserved[2] = autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=true,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTi
me=232,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290858199279,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)
,currentThread=Thread[Thread-126,5,Pooled Threads],lastUser=null,currentError=null,currentErrorTimestamp=null,JDBC4Runtime=true,supportStatementPoolable=true,needRestoreClientInfo=false,defaultClientInf
o={},supportIsValid=true
Resource Pool:XE:dumpPool reserved[3] = autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=true,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTi
me=206,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290858199262,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)

Connection pool overload on Weblogic server - forcibly release inactive connection

The number of inactive seconds on a reserved connection before WebLogic Server reclaims the connection and releases it back into the connection pool.

You can use the Inactive Connection Timeout feature to reclaim leaked connections - connections that were not explicitly closed by the application. Note that this feature is not intended to be used in place of properly closing connections.

When set to 0, the feature is disabled.

MBean Attribute (Does not apply to application modules) :
JDBCConnectionPoolParamsBean.InactiveConnectionTimeoutSeconds



Test classes which overload connection pool by holding connections

package dave;

import java.sql.Connection;
import java.sql.SQLException;

import javax.ejb.Stateless;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

/**
 * Session Bean implementation class TestSesssionEJB
 */
@Stateless(mappedName = "TestSesssionEJB")

public class TestSesssionEJB implements TestSesssionEJBRemote, TestSesssionEJBLocal {

    /**
     * Default constructor. 
     */
    public TestSesssionEJB() {
        
        
    }
    
    //@Resource (name="jdbc/XE") 
    //javax.sql.DataSource ds;
    
    public String hello(String name){
        
        System.out.println("Hello" + name);
        
        InitialContext ic;
        DataSource dsLookup = null;
        try {
            ic = new InitialContext();
        
            dsLookup = (DataSource) ic
                    .lookup("jdbc/XE");
        } catch (NamingException e) {
            e.printStackTrace();
        }
        
        
         for(int i=0; i<15;i++){
             Connection conn = null;
            try {
                conn = dsLookup.getConnection();
                DbExecutor de = new DbExecutor(conn);
                 new Thread(de).start();
            } catch (SQLException e) {
                e.printStackTrace();
            }
             
        }
         
         System.out.println("Main: started all");
        
        return name;
        
    }
    

    
}

package dave;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DbExecutor implements Runnable {
    
    Connection  conn;
    
    public DbExecutor(Connection  conn) {
        this.conn = conn;
    }

    @Override
    public void run() {
        try {
            Thread thread =  Thread.currentThread();
            
            System.out.println("Start thread.id=" + thread.getId());

            PreparedStatement stmt = conn
                    .prepareStatement("select * from dave");
            
            
            
            System.out.println("Thread id=" + thread.getId() + 
                    " Query dave db using container injected ds thread.id=");

            stmt.execute();

            ResultSet rs = stmt.getResultSet();
            
            try {
                System.out.println("Thread id=" + thread.getId() + 
                " gor result, going to sleep for 60 s");
                Thread.sleep(60000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            while (rs.next()) {
                System.out.println("Thread id=" +"dave=" + rs.getString("DSTR") + " id="
                        + rs.getInt("ID"));
            }

        } catch (SQLException e) {
            e.printStackTrace();
        }
        
    }
    
    
    


}

Overloaded JDBC connection pool statistics in Admin console



Admin server log for connection forcibly taken back by Weblogic

<Nov 27, 2010 12:22:25 PM CET> <Warning> <Common> <BEA-000620> <Forcibly releasing inactive resource "autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=false,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTime=100,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290856766085,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)
,currentThread=Thread[Thread-70,5,Pooled Threads],lastUser=null,currentError=null,currentErrorTimestamp=null,JDBC4Runtime=true,supportStatementPoolable=true,needRestoreClientInfo=false,defaultClientInfo={},supportIsValid=true" back into the pool "XE".> 
<Nov 27, 2010 12:22:25 PM CET> <Warning> <Common> <BEA-000620> <Forcibly releasing inactive resource "autoCommit=true,enabled=true,isXA=true,isJTS=false,vendorID=0,connUsed=false,doInit=false,'null',destroyed=false,poolname=XE,appname=null,moduleName=null,connectTime=337,dirtyIsolationLevel=false,initialIsolationLevel=2,infected=false,lastSuccessfulConnectionUse=1290856766082,secondsToTrustAnIdlePoolConnection=10,currentUser=java.lang.Exception
    at weblogic.jdbc.common.internal.ConnectionEnv.setup(ConnectionEnv.java:318)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:344)
    at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)
    at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)
    at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:61)
    at weblogic.jdbc.jta.DataSource.getXAConnectionFromPool(DataSource.java:1670)
    at weblogic.jdbc.jta.DataSource.refreshXAConnAndEnlist(DataSource.java:1468)
    at weblogic.jdbc.wrapper.JTAConnection.getXAConn(JTAConnection.java:199)
    at weblogic.jdbc.wrapper.JTAConnection.checkConnection(JTAConnection.java:68)
    at weblogic.jdbc.wrapper.Connection.preInvocationHandler(Connection.java:93)
    at weblogic.jdbc.wrapper.Connection.prepareStatement(Connection.java:480)
    at dave.DbExecutor.run(DbExecutor.java:24)
    at java.lang.Thread.run(Thread.java:619)
,currentThread=Thread[Thread-116,5,Pooled Threads],lastUser=java.lang.Throwable,currentError=null,currentErrorTimestamp=null,JDBC4Runtime=true,supportStatementPoolable=true,needRestoreClientInfo=false,defaultClientInfo={},supportIsValid=true" back into the pool "XE".> 

Connection Pool Diagnostics

Inactive Connection Timeout

Create Java EE project using Eclipse Helios 3.6. and Weblogic 10.3.3

Add Weblogic 10.3.3 runtime in Servers tab

Create EAR project


Create EJB project

Create session EJB





Add Session EJB method implementation

package dave;

import javax.ejb.Stateless;

/**
 * Session Bean implementation class TestSesssionEJB
 */
@Stateless(mappedName = "TestSesssionEJB")
public class TestSesssionEJB implements TestSesssionEJBRemote, TestSesssionEJBLocal {

    /**
     * Default constructor. 
     */
    public TestSesssionEJB() {
        
        
    }
    
    public String hello(String name){
        
        System.out.println("Hello" + name);
        
        return name;
        
    }

}

Add EJB project into EAR


Run on Server - deployment




Create wlfullclient.jar by running in $WLS_HOME/server/lib
java -jar wljarbuilder.jar

Add wlfullclient.jar and testEJB project to client classpath


Create client class


Get EJB name from JNDI tree


Create client implementation

package dave;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

public class TestClient {

    private static String INITIAL_CONTEXT_NAME = "weblogic.jndi.WLInitialContextFactory";
    private static String PROVIDER_URL = "t3://localhost:7001";
    private static String JNDI_NAME = "TestSesssionEJB#dave.TestSesssionEJBRemote";

    public static void main(String[] args) throws Exception {
        
        Context ctx = getInitialContext();
        
        TestSesssionEJBRemote testEJB = (TestSesssionEJBRemote) ctx
                .lookup(JNDI_NAME);

        System.out.println("Say hello: " + testEJB.hello("dave"));

    }

    private static Context getInitialContext() throws NamingException {
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY, INITIAL_CONTEXT_NAME);
        env.put(Context.PROVIDER_URL, PROVIDER_URL);
        return new InitialContext(env);
    }

}

Check server log

<Nov 27, 2010 8:44:32 AM CET> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to RUNNING> 
<Nov 27, 2010 8:44:32 AM CET> <Notice> <WebLogicServer> <BEA-000360> <Server started in RUNNING mode> 
Nov 27, 2010 8:44:42 AM com.sun.faces.config.ConfigureListener contextInitialized
INFO: Initializing Sun's JavaServer Faces implementation (1.2_03-b04-FCS) for context '/console'
Nov 27, 2010 8:44:42 AM com.sun.faces.config.ConfigureListener contextInitialized
INFO: Completed initializing Sun's JavaServer Faces implementation (1.2_03-b04-FCS) for context '/console'

Hellodave

Set JVM default property with _JAVA_OPTIONS

export _JAVA_OPTIONS=-Djava.awt.headless=true

java |more
Picked up _JAVA_OPTIONS: -Djava.awt.headless=true

Setting JVM -Djava.awt.headless=true is necessary if X server is not available.
Without this property following error is thrown:

Exception in thread "main" java.lang.InternalError: Can't connect to X11 window server using '' as the value of the DISPLAY variable.
        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
        at sun.awt.X11GraphicsEnvironment.access$100(X11GraphicsEnvironment.java:52)
        at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:155)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:169)
        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
        at sun.font.FontManager.initSGEnv(FontManager.java:1307)
        at sun.font.FontManager.findFont2D(FontManager.java:1984)
        at java.awt.Font.getFont2D(Font.java:455)
        at java.awt.Font.canDisplay(Font.java:1904)
        at java.awt.Font.canDisplayUpTo(Font.java:1970)
        at java.awt.font.TextLayout.singleFont(TextLayout.java:451)
        at java.awt.font.TextLayout.<init>(TextLayout.java:509)
        at org.apache.poi.hssf.usermodel.HSSFSheet.autoSizeColumn(HSSFSheet.java:1675)

Parse connection string using Java RegEx

http://download.oracle.com/javase/tutorial/essential/regex/index.html

http://download.oracle.com/javase/6/docs/api/java/util/regex/package-summary.html

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class TestRegEx {

    /**
     * @param args
     */
    public static void main(String[] args) {

        String input = "dbuser:passwd@(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(Host=dbhost)(PORT=1520)))(CONNECT_DATA=(SID=MY_DB)))";

        getParam(input, "Host");
        getParam(input, "HOST");
        // getParam(input,"xHOST");

        Pattern pattern = Pattern.compile("(\\w+)@(\\w+)/(\\S+)");
        Matcher matcher = pattern.matcher("username@hostname//dir1/dir2");

        if (matcher.matches()) {
            System.out.println("User " + matcher.group(1));
            System.out.println("Host " + matcher.group(2));
            System.out.println("Dir " + matcher.group(3));
        }

    }

    public static String getParam(String input, String paramName) {

        Pattern pattern = Pattern.compile(paramName + "=(\\w+)",
                Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(input);

        System.out.println("Matching " + pattern.pattern());

        if (matcher.find()) {
            System.out.println("Matched " + matcher.group(1) + " in "
                    + matcher.group(0));
            return matcher.group(1);
        } else {
            throw new RuntimeException("Cannot find db connection parameter "
                    + paramName + " in " + input);
        }

    }

}

Configure Java logging file handler

http://download.oracle.com/javase/6/docs/api/java/util/logging/package-summary.html


java.util.logging.config.file defines file used
by LogManager to configure root logger

FileHandler

%g the generation number to distinguish rotated logs

java.util.logging.FileHandler.count specifies how many output files to cycle through (defaults to 1).

http://www.linuxtopia.org/online_books/programming_books/thinking_in_java/TIJ317_021.htm

FileHandlers for non-root logger must be specified using Java.

FileHandler fh = null;
        try {
            fh = new FileHandler("dave." + System.getenv("serverName")+ "%g.log",
                    500000,
                    10
            );
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        lgr2.addHandler(fh);

JDK Tools and Utilities

JDK Tools and Utilities

Monitoring and Management

Java Troubleshooting, Profiling, Monitoring and Management Tools

Java VisualVM

jvisualvm

A graphical tool that provides detailed information about the Java technology-based applications (Java applications) while they are running in a Java Virtual Machine. Java VisualVM provides memory and CPU profiling, heap dump analysis, memory leak detection, access to MBeans, and garbage collection.

jconsole A JMX-compliant graphical tool for monitoring a Java virtual machine. It can monitor both local and remote JVMs. It can also monitor and manage an application.

Monitoring Tools

jps JVM Process Status Tool - Lists instrumented HotSpot Java virtual machines on a target system.

jstat JVM Statistics Monitoring Tool - Attaches to an instrumented HotSpot Java virtual machine and collects and logs performance statistics as specified by the command line options.

Troubleshooting Tools

jinfo Configuration Info for Java - Prints configuration information for a given process or core file or a remote debug server.

jhat Heap Dump Browser - Starts a web server on a heap dump file (eg, produced by jmap -dump), allowing the heap to be browsed.

jmap Memory Map for Java - Prints shared object memory maps or heap memory details of a given process or core file or a remote debug server.

jsadebugd Serviceability Agent Debug Daemon for Java - Attaches to a process or core file and acts as a debug server.

jstack Stack Trace for Java - Prints a stack trace of threads for a given process or core file or remote debug server.