Recent questions tagged jvm

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jvm arguments - JVM Options List - still being maintained post Oracle?

Is the JVM Options List still being maintained anywhere? It seems to have disappeared from Oracle's website, but ... Wayback Machine has a copy. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Is there a clever way to determine the length of Java bytecode instructions?

I'm creating a static analysis tool for Java, and there's some information about the programs I'm ... in the Java bytecode instructions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Using Terracotta for (distributed) shared Java Objects

How do you share an instance / object across different Java processes? EnvironmentConfig config = new EnvironmentConfig() ... is possible, how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - (Boolean. false) in Clojure

According to http://hyperpolyglot.org/lisp, the only falsehoods in Clojure are false and nil. Indeed, ... was it simply overlooked? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - what is shared objects file?

When run the jvm in verbose mode it shows files are loading from shared object file as shown below [Loaded ... loaded from shared object file. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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787 views

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jvm - IS there a way to turn off JIT compiler and is there a performance impact by doing so?

What does it mean for a java program to be JIT'ed and does it make the execution a lot more faster or are there bytecodes which are not JIT'ed? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Handle signals in the Java Virtual Machine

Is it possible to handle POSIX signals within the Java Virtual Machine? At least SIGINT and SIGKILL should be quite platform independent. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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668 views

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jvm - Java class is present in classpath but startup fails with Error: Could not find or load main class

I have a jar file foobar.jar containing the following two classes: public class Foo { public static ... .ClassNotFoundException in that case? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Disable Java JIT for a specific method/class?

I'm having an issue in my Java application where the JIT breaks the code. If I disable the JIT, everything works ... build 14.2-b01, mixed mode) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Behavior of a Java process in case of OutOfMemoryError

What would be the behavior of a Java program on getting OutOfMemoryError. Is there any defined behavior? Will the ... handling it in my code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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781 views

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jvm - Eclipse's error on startup in windows 7

Good day. I decided to learn Java. I installed JDK and downloaded eclipse-java-helios-SR1-win32 for windows 7. ... few mistakes in the log. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Unrecognized VM option 'UseParNewGC' , Error: Could not create the Java Virtual Machine

I am trying to start a server using jre 10.0.1 64 bit. There is an obvious change in the ... XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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885 views

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jvm - How do I add a new Currency to java.util.Currency for an existing country code in Java 7?

For example, the Chinese currency has the ISO 4217 code CNY. Since free global trading in that currency is ... that file no longer exists. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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838 views

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jvm - Generate Java Heap Dump on uncaught Exception

I try to generate a Heap Dump when a uncaught exception is fired. I tried using jmap, but because the process is ... . Using a GUI is no option See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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731 views

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jvm - What is the maximum of number of arguments for varargs in java?

What is the maximum of number of arguments which can be used by a vararg in java ? I believe there should be some limit and it is not infinite. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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jvm - Cassandra and Java 9 - ThreadPriorityPolicy=42 is outside the allowed range

Very recently I installed JDK 9 and Apache Cassandra from the official site. But now when I start cassandra in ... override or remove this flag? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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739 views

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jvm - How to dump Permgen?

I wanted to take the dump of the Permgen of a application server. I do not want to use -XX:+TraceClassLoading - ... i can supply only the pid. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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742 views

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jvm - What is the difference between JDK_JAVA_OPTIONS and JAVA_TOOL_OPTIONS when using Java 11?

What is the exact difference between JDK_JAVA_OPTIONS and JAVA_TOOL_OPTIONS when using Java 11? I'm using a tiny ... AdoptOpenJDK 11 build 28. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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jvm - Missing tools.jar when launching STS application

I have the latest STS4. I am using installed java-1.8 JDK not embedded as the execution environment. My project just ... get rid of this pop up. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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828 views

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jvm - How is scala generating byte code? Using some libraries like ASM, or write binary directly?

I'm wondering how is scala generating byte code, does it use some libraries like ASM? Or just write binary to .class files for performance? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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945 views

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jvm - Java Could not reserve enough space for object heap error

I have Java7 running on 32-bit Windows and 4 GB RAM, but: java -Xmx4G -Xms4G -jar Minecraft.jar java - ... jar Minecraft.jar is working. Why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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784 views

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jvm - OpenJDK vs Java HotspotVM

Are OpenJDK VM and Oracle Hotspot VM still two different JVMs? I can't seem to find any somewhat official ... have different runtime flag sets? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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989 views

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jvm - Default values for Xmx, Xms, MaxPermSize on non-server-class machines

What are the default values for the following options in Java 6 on a non-server-class machine? -Xmx - ... runtime based on system configuration See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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663 views

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jvm - Are there any specific examples of backward incompatibilities between Java versions?

Have there been incompatibilities between Java releases where Java source code/Java class files targeting Java ... a backwards incompatibility. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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796 views

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jvm - When multiple java programs run on the same machine

Each java application will run in a specific Java Virtual Machine Instance. I am really getting confused on ... threads I assume) affected? See Question&Answers more detail:os...

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

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701 views

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jvm - what java virtual machine will do while executing multiple java applications

By reading this article, I know that each java application will run in a specific Java Virtual Machine Instance. So ... example, How it works. See Question&Answers more detail:os...

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

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1.3k views

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jvm - How to get Java8 Metaspace dump (not heap dump)

Are there any tools that are able to get Metaspace dump from a Java8 hotspot vm ? See Question&Answers more detail:os...

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

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705 views

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jvm - Why does Java , running in -server mode, say that the version is "mixed-mode"?

Why does Java , running in -server mode, say that the version is "mixed-mode" ? When I see that, does it ... 't truly load in pure server mode? See Question&Answers more detail:os...

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

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