Recent questions tagged jvm

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jvm - Does Java JIT cheat when running JDK code?

I was benchmarking some code, and I could not get it to run as fast as with java.math.BigInteger, even ... 't. What explains this difference? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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949 views

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jvm - Preloading java classes/libraries at jar startup?

A time-out occurs during the first RPC call to a server yet subsequest requests succeed. The server times-out on ... a delay on the first call? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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909 views

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jvm - Totally Confused with java.exe

The JDK is the superset of JRE. JDK has the necessary tools like javac java.exe debugger etc + JRE. But JRE ... of JDK tools? Please explain. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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jvm - Kotlin unresolved reference in IntelliJ

I started off with this tutorial for learning Kotlin in IntelliJ IDEA. When I tried running the following example, ... valid for my situation. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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jvm - Inlining in Java

In C++ I can declare a method "inline" and the compiler is likely to inline it. As far as I understand ... to do so? Can I influence this decision somehow? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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943 views

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jvm - What is the replacement for javax.activation package in java 9?

Seems like javax.activation package is deprecated in Java 9. Oracle migration guide proposes to use --add-modules java. ... there is any available, what is it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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819 views

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jvm - Eclipse error: 'Failed to create the Java Virtual Machine'

I am getting this error message when I start Eclipse Helios on Windows 7: Failed to create the Java Virtual ... for '-Xmx' and '--launcher.XXMaxPermSize'? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

1 answer

jvm - How to lock compiled Java classes to prevent decompilation?

How do I lock compiled Java classes to prevent decompilation? I know this must be very well discussed topic on the ... example, VC++) and call them via JNI? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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945 views

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jvm - Where are static methods and static variables stored in Java?

For example: class A { static int i=0; static int j; static void method() { // static k=0; can't use ... , in heap or in stack memory? How are they stored? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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831 views

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jvm - Entry point for Java applications: main(), init(), or run()?

So far I've been using public void run() {} methods to execute my code in Java. When/why might one want to use main() or init() instead of run()? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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993 views

1 answer

jvm - How to increase application heap size in Eclipse?

Some say I need to do that in Run Configurations for my application. When I open that window, could you please tell me ... memory? Say how to set 2GB or 1.5GB? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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773 views

1 answer

jvm - What is in Java object header?

Could you give me some information on what is exactly stored in object header? I know, that it's probably JVM ... a link to OpenJDK wiki that says it all? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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831 views

1 answer

jvm - How to get a thread and heap dump of a Java process on Windows that's not running in a console

I have a Java application that I run from a console which in turn executes an another Java process. I want to ... Is there another way to get that heap dump? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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905 views

1 answer

jvm - Getting Java version at runtime

I need to work around a Java bug in JDK 1.5 which was fixed in 1.6. I'm using the following condition: if ... other JVMs? Is there a better way to check this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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895 views

1 answer

jvm - Java 32-bit vs 64-bit compatibility

Will Java code built and compiled against a 32-bit JDK into 32-bit byte code work in a 64-bit JVM? Or ... upgrading the JDK and Weblogic Server to 64-bit. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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970 views

1 answer

jvm - How to get VM arguments from inside of Java application?

I need to check if some option that can be passed to JVM is explicitly set or has its default value. To be ... Is there any way to get the information I need? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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688 views

1 answer

jvm - Real differences between "java -server" and "java -client"?

Is there any real practical difference between "java -server" and "java -client"? All I can find on Sun's ... real differences? (Using JDK 1.6.0_07 currently.) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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706 views

1 answer

jvm - How to deal with "java.lang.OutOfMemoryError: Java heap space" error?

I am writing a client-side Swing application (graphical font designer) on Java 5. Recently, I am running into ... heap size dynamically, that will be great. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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932 views

1 answer

jvm - How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

I am trying to use Notepad++ as my all-in-one tool edit, run, compile, etc. I have JRE installed, ... the difference between the PATH variable in JRE or JDK? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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707 views

1 answer

jvm - How do I write a correct micro-benchmark in Java?

How do you write (and run) a correct micro-benchmark in Java? I'm looking for some code samples and ... and why? Related: Is stopwatch benchmarking acceptable? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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735 views

1 answer

jvm - Is there a way to soft-change Java version?

I have an old application which refuses to start on versions of Java that it was not tested on. Unfortunately it ... /questions/65841455/is-there-a-way-to-soft-change-java-version...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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787 views

1 answer

jvm - Will java machine code be the same on the same hardware?

I know that java source code will be compiled to bytecode, and JVM will interpret that bytecode and translates it into ... /will-java-machine-code-be-the-same-on-the-same-hardware...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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840 views

1 answer

jvm - Entry point for Java applications: main(), init(), or run()?

So far I've been using public void run() {} methods to execute my code in Java. When/why might one want ... .com/questions/261428/entry-point-for-java-applications-main-init-or-run...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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814 views

1 answer

jvm - Entry point for Java applications: main(), init(), or run()?

So far I've been using public void run() {} methods to execute my code in Java. When/why might one want ... .com/questions/261428/entry-point-for-java-applications-main-init-or-run...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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926 views

1 answer

jvm - Maven 2.1.0 not passing on system properties to Java virtual machine

We use the command line to pass on system properties to the Java virtual machine when running our Hudson builds on ... 1-0-not-passing-on-system-properties-to-java-virtual-machine...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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650 views

1 answer

jvm - Inlining in Java

In C++ I can declare a method "inline" and the compiler is likely to inline it. As far as I ... ? question from:https://stackoverflow.com/questions/1159087/inlining-in-java...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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884 views

1 answer

jvm - Performance: greater / smaller than vs not equal to

I wonder if there is a difference in performance between checking if a value is greater / smaller than ... questions/18596300/performance-greater-smaller-than-vs-not-equal-to...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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880 views

1 answer

jvm - Performance: greater / smaller than vs not equal to

I wonder if there is a difference in performance between checking if a value is greater / smaller than ... questions/18596300/performance-greater-smaller-than-vs-not-equal-to...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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