Java.lang.instrumentation (looking for examples, code snippets)

I'm exploring the use of java.lang.instrumentation, management for a variety of tasks such as profiling, monitoring, etc.
I'm looking for some code snippets and examples to get me bootstrapped. Didn't find any doing a search.

Unfortunately there aren't any examples of java.lang.instrument usage available yet. I will try to rectify this.
java.lang.instrument.Instrumentation is an interface, but it is not an interface that users of java.lang.instrument implement. A single instance of a class, internal to the JRE, which implements this interface is created if and only if the -javaagent flag is used. This sole instance is then passed into the premain method.
Robert G. Field
JSR-163 Specification Lead

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Starting WebLogic Server ....
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Seen this, may give a clue?
Server Known Problems Change Request Number Description
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"lazar" <[email protected]> wrote:
>
I would also like to know, if there is a fix for it.
Thanks
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Did you ever get an answer to this. If so could you share it with me.ThanksGreg

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Hi,
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Joe Jerry
Raj Kathlesar wrote:
Hi,
I am using WL60SP2 on Windows NT 4.0.
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home = lookupHome();
messageSubscriber = (MessageSubscriber) narrow(home.create(),
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Java.lang.SecurityException: Authentication for user system denied in realm wl_realm

I am experiencing this error when a servlet or JSP is preloaded on the web
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java.lang.SecurityException: Authentication for user system denied in realm
wl_realm
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weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutboundRequest.
java:85)
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va:106)
at
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30)
at
weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java
:700)
at
weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.ja
va:643)
at
weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.jav
a:588)
at
weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletC
ontext.java:2203)
at
weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServlet
Context.java:2147)
at
weblogic.servlet.internal.WebAppServletContext.init(WebAppServletContext.jav
a:884)
at
weblogic.servlet.internal.WebAppServletContext.<init>(WebAppServletContext.j
ava:807)
at
weblogic.servlet.internal.HttpServer.loadWebApp(HttpServer.java:421)
at weblogic.j2ee.WebAppComponent.deploy(WebAppComponent.java:74)
at weblogic.j2ee.Application.addComponent(Application.java:160)
at weblogic.j2ee.J2EEService.addDeployment(J2EEService.java:117)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:329)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:144)
at
weblogic.management.mbeans.custom.WebServer.addWebDeployment(WebServer.java:
76)
at java.lang.reflect.Method.invoke(Native Method)
at
weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl
.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
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at $Proxy33.addWebDeployment(Unknown Source)
at
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t(WebServerMBean_CachingStub.java:1094)
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weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:315)
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Target.java:279)
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at
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at java.lang.reflect.Method.invoke(Native Method)
at
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.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:449)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:190)
at $Proxy32.updateDeployments(Unknown Source)
at
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ServerMBean_CachingStub.java:2734)
at
weblogic.management.mbeans.custom.ApplicationManager.startConfigManager(Appl
icationManager.java:362)
at
weblogic.management.mbeans.custom.ApplicationManager.start(ApplicationManage
r.java:154)
at java.lang.reflect.Method.invoke(Native Method)
at
weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl
.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:449)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:190)
at $Proxy45.start(Unknown Source)
at
weblogic.management.configuration.ApplicationManagerMBean_CachingStub.start(
ApplicationManagerMBean_CachingStub.java:480)
at
weblogic.management.Admin.startApplicationManager(Admin.java:1151)
at weblogic.management.Admin.finish(Admin.java:570)
at weblogic.t3.srvr.T3Srvr.start(T3Srvr.java:506)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:203)
at weblogic.Server.main(Server.java:35)
Thanks,
Jed Zimmer

You're correct. I meant the DOMAIN_SYSTEM_PASSWORD password in my
<domain-name>domain.ksh file. The DOMAIN_SYSTEM_PASSWORD value (if
specified) has to match the system user's password or else the server will
not start/stop.
I have determined more since my post. A startup class also produces the
same error. I have minimized my environments as follows and still receive
the exception, and a soon as I synchronize the system users' passwords on
the app/web server the problem goes away. Or, I can keep the passwords
different and just not access the app server EJBs until after the web server
finished loading, which also causes the error to go away. I'm just confused
about what I might be doing wrong.
Steps to produce the error:
App server:
- Installed from 6.1.1.0 from scratch and started it up.
- Changed the system user's password from the admin console, persisting the
changes.
- Modified logging settings to see more info in the log files.
- Disabled instrument stack traces.
- Stopped/Started the app server
Web server:
- Installed from 6.1.1.0 from scratch and started it up.
- Modified logging settings to see more info in the log files.
- Disabled instrument stack traces.
- Added a servlet to the DefaultWebApp_insiteserver application
- specified name and class
- the load on startup setting defaulted to zero, which will cause the
preloading
- Added 3 jar files to the classpath to support the EJB call
- Stopped/Started the web server
When the web server loads the servlet loads and tries to locate the EJB on
the app server. The app server throws the security exception. The app/web
servers are both running on the same SUN box, have the same IP address
(different ports) and I'm using non-SSL. Each server is it's own WLS
environment. The only installed file that is shared it the
weblogic_domain_registry.dat file in the root directory. As for security,
I'm doing nothing except changing one password (system user on the app
server).
I then tried to manually upgrade the app/web servers to 6.1.2.0 by updating
the WEBLOGIC_ROOT in the respective xxxxdomain.ksh files. Same problem.
I then cleanly reinstalled the app/web servers using version 6.1.2.0 and
configured as above. Same problem.
Let me know if I need to provide additional details.
Thanks,
Jed Zimmer
"Joseph Nguyen" <[email protected]> wrote in message
news:[email protected]...
>
"Jed Zimmer" <[email protected]> wrote in message
news:[email protected]...
I am experiencing this error when a servlet or JSP is preloaded on the
web
server and the init method of the preloaded item results in a call tothe
app server. If I don't preload and then manually invoke the JSP orservlet
after the web server completely loads the call to the app server does
not
produce the exception. The only security differences between the weband
app servers are the console and system passwords. I can fix the problemby
making the passwords (system and console) the same across the board, but
find it hard to believe that this is the true solutionI don't quite understand what you mean by "console" password? Are you
talking about the admin console? If so then it's confusing because youhave
to log into the console using the system user. If you can clarify morehere
it would great.
Joseph Nguyen
BEA Support
. I would prefer
sticking with the default security settings.
I've poured through hundreds of messages. I can find similar problems
but
not this exact problem.
Any ideas would truly be appreciated!
More information:...
App and Web server are both wls 6.1.1.0 running on the same SUN Solarisbox.
Both are using the basic, out of the box, security.
The App server has SSL disabled.
The exception reported in the app server's log is:
java.lang.SecurityException: Authentication for user system denied inrealm
wl_realm
at weblogic.security.acl.Realm.authenticate(Realm.java:212)
atweblogic.security.acl.Realm.getAuthenticatedName(Realm.java:233)
at
weblogic.security.acl.internal.Security.authenticate(Security.java:125)
atweblogic.security.acl.internal.Security.verify(Security.java:87)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:235)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:2
2)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
The exception reported in the web server's log is:
java.lang.SecurityException: Authentication for user system denied inrealm
wl_realm
at
weblogic.rmi.internal.BasicOutboundRequest.sendReceive(BasicOutboundRequest.
java:85)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java
:255)
at
weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java
:222)
at weblogic.rmi.internal.ProxyStub.invoke(ProxyStub.java:35)
at $Proxy54.lookup(Unknown Source)
at
weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:323)
at javax.naming.InitialContext.lookup(InitialContext.java:350)
at
com.qwest.tmmt.manager.client.MDMAdapter.getEJBHome(MDMAdapter.java:197)
at
com.qwest.tmmt.manager.client.MDMAdapter.<init>(MDMAdapter.java:64)
at
com.qwest.tmmt.manager.client.ManagerFactory.createMetaDataManager(ManagerFa
ctory.java:305)
at
com.qwest.insite.util.ClientMetaDataCache.<init>(ClientMetaDataCache.java:53
at
com.qwest.insite.util.ClientMetaDataCache.getInstance(ClientMetaDataCache.ja
va:106)
at
com.qwest.insite.metadata.startup.MetaDataServlet.init(MetaDataServlet.java:
30)
at
weblogic.servlet.internal.ServletStubImpl.createServlet(ServletStubImpl.java
:700)
at
weblogic.servlet.internal.ServletStubImpl.createInstances(ServletStubImpl.ja
va:643)
at
weblogic.servlet.internal.ServletStubImpl.prepareServlet(ServletStubImpl.jav
a:588)
at
weblogic.servlet.internal.WebAppServletContext.preloadServlet(WebAppServletC
ontext.java:2203)
at
weblogic.servlet.internal.WebAppServletContext.preloadServlets(WebAppServlet
Context.java:2147)
at
weblogic.servlet.internal.WebAppServletContext.init(WebAppServletContext.jav
a:884)
at
weblogic.servlet.internal.WebAppServletContext.<init>(WebAppServletContext.j
ava:807)
at
weblogic.servlet.internal.HttpServer.loadWebApp(HttpServer.java:421)
at weblogic.j2ee.WebAppComponent.deploy(WebAppComponent.java:74)
at weblogic.j2ee.Application.addComponent(Application.java:160)
at weblogic.j2ee.J2EEService.addDeployment(J2EEService.java:117)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:329)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:144)
at
weblogic.management.mbeans.custom.WebServer.addWebDeployment(WebServer.java:
76)
at java.lang.reflect.Method.invoke(Native Method)
at
weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl
.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:449)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:190)
at $Proxy33.addWebDeployment(Unknown Source)
at
weblogic.management.configuration.WebServerMBean_CachingStub.addWebDeploymen
t(WebServerMBean_CachingStub.java:1094)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployment(DeploymentT
arget.java:315)
at
weblogic.management.mbeans.custom.DeploymentTarget.addDeployments(Deployment
Target.java:279)
at
weblogic.management.mbeans.custom.DeploymentTarget.updateServerDeployments(D
eploymentTarget.java:233)
at
weblogic.management.mbeans.custom.DeploymentTarget.updateDeployments(Deploym
entTarget.java:193)
at java.lang.reflect.Method.invoke(Native Method)
at
weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl
.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:449)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:190)
at $Proxy32.updateDeployments(Unknown Source)
at
weblogic.management.configuration.ServerMBean_CachingStub.updateDeployments(
ServerMBean_CachingStub.java:2734)
at
weblogic.management.mbeans.custom.ApplicationManager.startConfigManager(Appl
icationManager.java:362)
at
weblogic.management.mbeans.custom.ApplicationManager.start(ApplicationManage
r.java:154)
at java.lang.reflect.Method.invoke(Native Method)
at
weblogic.management.internal.DynamicMBeanImpl.invokeLocally(DynamicMBeanImpl
.java:608)
at
weblogic.management.internal.DynamicMBeanImpl.invoke(DynamicMBeanImpl.java:5
92)
at
weblogic.management.internal.ConfigurationMBeanImpl.invoke(ConfigurationMBea
nImpl.java:352)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1555)
at
com.sun.management.jmx.MBeanServerImpl.invoke(MBeanServerImpl.java:1523)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:449)
at
weblogic.management.internal.MBeanProxy.invoke(MBeanProxy.java:190)
at $Proxy45.start(Unknown Source)
at
weblogic.management.configuration.ApplicationManagerMBean_CachingStub.start(
ApplicationManagerMBean_CachingStub.java:480)
at
weblogic.management.Admin.startApplicationManager(Admin.java:1151)
at weblogic.management.Admin.finish(Admin.java:570)
at weblogic.t3.srvr.T3Srvr.start(T3Srvr.java:506)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:203)
at weblogic.Server.main(Server.java:35)
Thanks,
Jed Zimmer

Still looking for examples

Hi
I have heep of books on Java security, but am still looking for examples that show how to Create, Import and Export certificates PROGRAMMATICALLY.
Does anyone know where I can find these.
regards

I can create certificates using Keytool, but I was wondering how to create certificates using java API

Java.lang.instrument.Instrumentation.getObjectSize(..) wrong in Jrockit

When using this method ( Instrumentation.getObjectSize(someObjectGraph) ) on Sun JVM HotSpot, I get accurate results.
When using on JRockit 1.6.0_26 I get result which is inaccurate by 8 bytes per object instance in the object graph.
I know the JavaDoc for the method leaves things ambiguous as to the accuracy of the result, but it would sure be great if JRockit could fix this.
Is there any way I can file a bug for this without having a support contract?

To reproduce, simply do this:
System.out.println("Size of new Object() is reported as: " + java.lang.instrument.Instrumentation.getObjectSize(new Object()) + " instead of 16");
(Of course 16 is not necessarily the expected size, depending upon compressed refs mode, etc.).
Edited by: 878671 on Aug 19, 2011 2:53 PM

Looking for Source Codes

hi everyone!
I am looking for source codes with the following characteristics:
- significant data processing (like fft or image processing algorithms)
- use of just a few classes and/or packages (it must not use awt or swing)
- code is not so big (200 lines of code at most)
- program is multithreaded (it is not necessary)
If anyone could help me, I would appreciate a lot.
Thanks.

Building a portfolio are we?

[svn] 4595: Fix for - Example code in ObjectProxy ASDoc page is incorrect

Revision: 4595
Author: [email protected]
Date: 2009-01-20 08:11:25 -0800 (Tue, 20 Jan 2009)
Log Message:
Fix for - Example code in ObjectProxy ASDoc page is incorrect
Also modify the build.xml for "ant asdoc"
QE Notes: None
Doc Notes: None
Bugs: SDK-18335
tests: checkintests
Ticket Links:
http://bugs.adobe.com/jira/browse/SDK-18335
Modified Paths:
flex/sdk/trunk/asdoc/build.xml
flex/sdk/trunk/frameworks/projects/framework/src/mx/utils/ObjectProxy.as

>
build url like this,
'<a href=f?p='||NV('APP_ID')||':45:'||V('APP_SESSION')||'::NO:RP,45,CIR:ub_branch,ub_supplier,ub_customer,ub_product,ub_aging,ub_destination:'||REPLACE(branch,' ','%20')||'%2C'||REPLACE(ub_supplier,' ','%20')||'%2C'||REPLACE(ub_customer,' ','%20')||'%2C'||REPLACE(ub_product,' ','%20')||'%2C'||REPLACE(ub_aging,' ','%20')||'%2C'||REPLACE(ub_destination,' ','%20') ||'>All</a>',All of this is handled by the apex_util.url_encode API function as described above.
However, as also mentioned above, the best approach is to only pass discrete key values in URLs.

Java.lang.instrumentation (looking for examples, code snippets)

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