I am trying to inspect the memory contents (bytes) of an object in a Java project.
The program is paused in the Eclipse IDE.
How ever: the Memory view is disabled - as in: the Add Memory monitor + button is greyed out.
Why?
This question seems to be unanswered for quite a while and the one above sure doesn't help. This is the only post about it I could find.
In the Eclipse Help platform information about Memory view can be found in the C/C++ Development User Guide > Reference > Debug Views > Memory View but that isn't useful when were on Java. In the Java Development Guide it isn't as easy to find. Adding just Java Development Guide to the scope and searching for memory returns information about the Memory View in Running and Debugging but doesn't help very much. It is a view but isn't found in the same > Reference > Debug Views > as the C/C++ Guide.
When running a program in Debug mode in Eclipse C\C++ the + in the Memory view lights up and you can add addresses. However, running your program in Debug view doesn't seem to do the same in Eclipse Java. I'm assuming it can't be used in Java Eclipse or has a special case use that isn't mentioned.
Using JConsole
The JConsole graphical user interface is a monitoring tool that complies to the Java Management Extensions (JMX) specification. JConsole uses the extensive instrumentation of the Java Virtual Machine (Java VM) to provide information about the performance and resource consumption of applications running on the Java platform.
In the Java Platform, Standard Edition (Java SE platform) 6, JConsole has been updated to present the look and feel of the Windows and GNOME desktops (other platforms will present the standard Java graphical look and feel). The screen captures presented in this document were taken from an instance of the interface running on Windows XP.
Starting JConsole
The jconsole executable can be found in JDK_HOME/bin, where JDK_HOME is the directory in which the Java Development Kit (JDK) is installed. If this directory is in your system path, you can start JConsole by simply typing jconsole in a command (shell) prompt. Otherwise, you have to type the full path to the executable file.
Command Syntax
You can use JConsole to monitor both local applications, namely those running on the same system as JConsole, as well as remote applications, namely those running on other systems.
source : http://docs.oracle.com/javase/6/docs/technotes/guides/management/jconsole.html
Related
Is there a good approach to remotely debug and step through JVM classes (think rt.jar) of the target JVM? For example if my main development environment is on Windows Oracle HotSpot JVM and I want to remotely debug the application running on the AIX IBM JVM? The bytecode/internal classes are different so the line numbers don't exactly match up to what my IDE is showing me.
IBM offers their SDK for Windows here - https://www.ibm.com/developerworks/java/jdk/java8/.
I have a headless Java application, running on a remote server as a daemon-style process.
I want to extract Java level profiling information from the process, of the sort displayed by JVisualVM. For example, it should show method invocation times and so on.
What is the best way of doing this? My understanding is that JVisualVM does not profile when connecting remotely.
Ideally, the profiling information would be stored in a file for later inspection, in a manner similar to Java heap generation (with jmap) and later analysis (with a heap inspector).
You can use NetBeans profiler remote profiling capability.
Remote Profiling
Profile an application that is running on a different system than your NetBeans IDE. The profiler's remote pack can be installed on a remote system, allowing you to profile an application that is started on that system.
In fact, VisualVM is based on it.
Beside various monitoring features, the tool contains a built-in profiler based on the NetBeans profiler. While the profiler UI in VisualVM looks simple (especially when compared to the NetBeans profiler), the profiling capabilities are almost as powerful as in NetBeans.
Here is a detailed blog post about Profiling a Java remote server using Netbeans.
According to the link you will have to set up jstatd and jmx:
http://javadevsoup.blogspot.de/2012/02/remote-java-profiling-using-visual-vm.html
I just found another product that I think does this: http://chrononsystems.com/products/chronon-recording-server
I'm looking for a tool which can profile the java application running as a windows service ( remotely/locally either way) .
I've come across VisualVM as one option. Are there any other products available other than VisualVm.I'm more interested in reputated product. Can Jprofiler do this for me?
VisualVM , Does it give class wise list of profiling ?
See this article, if you want to use Java VisualVM. It describes how java application running as a Windows service can be monitored and/or profiled using VisualVM.
JVisualVM is you best shot. It's free, comes with the JVM and gives you a pretty decent range of functionality. Not sure what you mean by "class wise list of profiling." But it will show you where the majority of your execution time is spent.
You can execute jvsiualvm by going to $JAVA_HOME/bin and typing jvisualvm. Then select the the vm you wish to profile.
You can use BTrace to instrument your application and to measure the parts of the application that you are interested in. BTrace logs its output to files, which you can later or in real-time transfer to a monitoring application, such as EurekaJ (which I've written myself).
Both tools are Open Sourced and free to use. BTrace uses the "GNU Public License v.2 w/Classpath Exception" license, while EurekaJ uses the GPLv3 license.
InfoQ Writeup on the two tool including VisualVM and a few commandline tools: http://www.infoq.com/articles/java-profiling-with-open-source
Link How can I monitor my Java application running as Windows Service with Visual VM? says that on recent Windows versions only JMX mode can be used, but not local.
Is there any profiler available in the java environment which can be used on a remote machine?
I have a .jar file (plain java code,nothing fancy) running on a remote machine and I want to profile that file. However,I can't install the profiler on the remote machine since I do not have the necessary permissions. Is there any way I can profile the application from my local machine?
Aall Java profilers I know have that ability, since the Java debugging interface (JVMTI) is inherently network-capable.
VisualVM has basic (but often sufficient) profiling features and comes with the JDK.
I'm attempting to profile junit tests in eclipse on OSX using TPTP. I installed the TPTP package from eclipse with no problem, I went to profile some code and it tells me:
Agent Controller is unavailable under port 10002.
Make sure that the service is started and the port number is correct
under preferences.
I searched around on the internets and discovered many complains about Agent Controller not being available for os X. Almost all of the java developers I know run eclipse under os x. Why would eclipse not support os x? Why even make the TPTP packages available for os x if os x can't run agent controller? Purely for remote debugging purposes?
Os X is built on BSD, Linux has an Agent Controller port. Has this been ported to os x?
Any ideas or success stories getting TPTP to work on os x (remote debugging on linux, agent controller replacements)?
What other options are there (Netbeans, VisualVM, JProfiler) and how good are they?
What does stackoverflow suggest I do?
Note: I am interested in profiling on class and method, of the number of times each method is called, and the amount of time the program spends in each method. Due to the complexity of the code using System.nanotime() statements are not an option.
According to the Eclipse TPTP FAQ
What platforms and environments does TPTP support?
The user interface components of the
TPTP Infrastructure can run on any
Eclipse-supported platform. The
various test execution, monitoring and
tracing components typically run on a
broad range of infrastructure and
interface with a broad range of
systems. One notable deficiency at
present is that the various trace
facilities are currently
Java-specific, although the project
has a goal to extend additional
language support in due course. For
the other agents there is a reasonable
coverage implemented or planned for
popular operating systems, application
servers, web servers etc, with a
particular focus on providing support
for other open source products.
Related Questions:
How can I see what parts of my code are running the most
Using java to get os level system information
if you have a java application that is consuming cpu when it isnt doing anything
Related Links:
Open Source Profilers for Java
As far as other Java profilers go, I think this is the best Stack Overflow question:
Please Recommend a Java Profiler
I personally would recommend YourKit Java Profiler, I've found it much more user-friendly than TPTP, and (while I haven't tested it) it should work on OS X.
Have you seen if the Netbeans profiler works under OS X? It is the original of which jvisualvm is a subset. It might just work...