As a C++ app, is there a way to query a java process(java.exe/javaw.exe) to retrieve the main class or jar file name that was passed to the JVM? I want the same result as when you run "jps -l": C:\>jps -l -V 2644 sun.tools.jps.Jps 4340 net.sourceforge.squirrel_sql.client.Main I think I could get the command line parameter and try to p...
How does IcedTea 6's performance stand up against Sun's own HotSpot on linux systems? I tried searching Google but Phoronix's test is the best I got, which is almost a year old now. Hopefully things have improved since then. Also, once Sun completely open sources the JVM, would it be possible to implement it for Linux platforms such tha...
I'm new to GWT development and I'm putting myself through the paces with Google's tutorial but I'm getting errors: java[10574:80f] [Java CocoaComponent compatibility mode]: Enabled 2009-11-06 15:27:38.769 java[10574:80f] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000 I checked my Java prefs and I ha...
I'm working on a project involving some large XML files (from 50MB to over 1GB) and it would be nice if I could view them in eclipse (simple text view is fine) without Java running out of heap space. I've tried tweaking the amount of memory available to the jvm in eclipse.ini but haven't had much success. Any ideas? ...
I have heard several people claiming that you can not scale the JVM heap size up. I've heard claims of the practical limit being 4 gigabytes (I heard an IBM consultant say that), 10 gigabytes, 32 gigabytes, and so on... I simply can not believe any of those numbers and have been wondering about the issue now for a while. So, I have thr...
I would like to use VisualVM to monitor a cluster of JVMs, say 50 - 100 processes. Is there a way to configure VisualVM to monitor to a specified list of JVMs on startup without adding them manually? ...
Hello All, I working on a Java based application which can be carried around by the user in a USB flash Drive. At the startup I want to check for existing JVMs on the machine the USB is plugged-in. How can I achieve it ??? ...
Looking around forums and the web, i have come across the advice that a method should have single entry and exit points. My first question is does the sinlge entry point apply to java. I can't see how a method can have an entry point other than invoking it and passing argumnets to it. The second question is that why only a single return...
I am trying to work on a project which involves running/executing the java file in three JVM on different Network. If i locally run the Java file should simultaneously should run in all three or two JVM. For example :/usr/local/helloWorld.java class HelloWorld { public static void main(String args[]){ System.out.print...
How to set an acknowledgement (like email or SMS) before JVM shuts down (this is on the server side, not client)? ...
I'd like to run competitions like code golf competitions, but the winner would have the fastest algorithm, not the smallest code. One fair way to measure speed of an algorithm is to use a neutral virtual machine, like Java's JVM. Is there an easy way to know the total number of JVM instructions executed? (If the entry uses multiple t...
Hello Guys Is there any possibility that I can directly send signal to a Java virtual machine which is created by calling JVM_CreateJavavm in native C/C++ code? e.g.: For a normal Java process, say its pid is 12345, I can send a signal 3 to it like this ... kill -3 12345, and hopefully I could trigger javacore or heapdump by changing...
Is it possible to change/modify/adding VM parameters after the JVM is already loaded (running)? If so, how can I do it? ...
i was running a jruby something.rb script and suddenly it throws this Error: Your application used more memory than the safety cap of 500m. Specify -J-Xmx####m to increase it (#### = cap size in MB). Specify -w for full OutOfMemoryError stack trace ...
Curious if anyone could help out in regards to a Java HotSpot dump...saw some reference to head over to the Sun Forums, figured I would try here first...below is the dump... # # An unexpected error has been detected by Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d8c8f23, pid=2836, tid=5980 # # Java VM...
Hello, I have a tomcat server running a webapp. Apart from this there are two other JVMs that run batch processing tasks. Jamon is a really cool way to monitor performance, hits etc., and can be viewed on the web using Jamonadmin.jsp (supplied with jamon war file). But I want to aggregate the Jamon statistics from the other two JVMs and...
hello, I hope you can help me on the problem we have with SUSE and JDK 1.4.x: my suse is PAE enabled with 15Gb RAM. unfotunately jvm cannot allocate more than 1900Mb for heap size. So java -Xmx2048m gives me an error. it seems you had the same problem, did you solve it? I hope so :) thanks Michelangelo ...
I have two machines, one running 2.4.18 and one running 2.4.20. Both run Java 1.5 build 13. On one machine (2.4.18), each thread shows up as a separate process in the ps output, and on the other the whole JVM shows up as one process. What is the distinguishing factor and can I control it? ...
Do the JVM and .NET VM allocate objects on the stack when it is obvious to the runtime that an objects lifetime is limited to a certain scope? ...
Hello, I have two applications running in the same java virtual machine, and both use different keystores and truststores. A viable option would be use a single keystore and import all the other ones into the shared keystore (e.g. keytool -import), but it would really help my requirements if I could use separate keystores for separate ...