我尝试使用Nailgun http://www.martiansoftware.com/nailgun/ on Debian GNU/Linux 9(延伸).
“Nailgun 是一个客户端、协议和服务器,用于从命令行运行 Java 程序,而不会产生 JVM 启动开销。程序在服务器中运行(用 Java 实现),并由客户端触发(用 C 编写),它处理所有 I/O。”
发现一些文档:
- 钉枪快速入门 http://www.martiansoftware.com/nailgun/quickstart.html
- JVM 启动时间/Nailgun https://august.nagro.us/jvm-startup.html#nailgun
- 如何使用nailgun服务器提高java性能 http://paramitech.com/how-to-improve-performance-of-java-using-nailgun-server/
- DSpace/钉枪 https://wiki.duraspace.org/display/DSPACE/Nailgun
I use Oracle Java 版本 10.0.2(我还尝试使用 GraalVM 1.0.0-rc9 Java 1.8.0_192)。
一个简单的Java程序来测试:TestVarargs.java https://bitbucket.org/OPiMedia/hellanguages/src/default/Java/standard/TestVarargs/TestVarargs.java。
(最后我想运行一个 JAR 文件,但我尝试过这个简单的示例,因为那不起作用。)
$ wget https://bitbucket.org/OPiMedia/hellanguages/raw/default/Java/standard/TestVarargs/TestVarargs.java
$ javac TestVarargs.java
$ java TestVarargs
该程序运行正确。
第一次尝试,与Debian 钉枪包 https://packages.debian.org/stretch/nailgun(版本0.9.1-3)
安装:
$ sudo apt-get remove nailgun
启动服务器:
$ java -jar /usr/share/java/nailgun-server.jar &
NGServer 0.9.1 started on all interfaces, port 2113.
运行客户端(/usr/bin/ng-nailgun
):
$ ng-nailgun ng-version
NailGun server version 0.9.1
但以下方法不起作用:
$ ng-nailgun ng-cp
java.lang.ClassCastException: java.base/jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to java.base/java.net.URLClassLoader
at com.martiansoftware.nailgun.builtins.NGClasspath.nailMain(NGClasspath.java:65)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.martiansoftware.nailgun.NGSession.run(NGSession.java:280)
$ ng-nailgun TestVarargs
java.lang.ClassNotFoundException: TestVarargs
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:291)
at com.martiansoftware.nailgun.NGSession.run(NGSession.java:242)
$ ng-nailgun ng-alias TV TestVarargs
java.lang.ClassNotFoundException: TestVarargs
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:291)
at com.martiansoftware.nailgun.builtins.NGAlias.nailMain(NGAlias.java:79)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.martiansoftware.nailgun.NGSession.run(NGSession.java:280)
停止命令正确运行:
$ ng-nailgun ng-stop
com.martiansoftware.nailgun.builtins.NGAlias: 2/0
com.martiansoftware.nailgun.builtins.NGClasspath: 5/0
com.martiansoftware.nailgun.builtins.NGServerStats: 0/0
com.martiansoftware.nailgun.builtins.NGStop: 1/1
com.martiansoftware.nailgun.builtins.NGVersion: 1/0
NGServer shut down.
第二次尝试,从GitHub 来源 https://github.com/facebook/nailgun
$ wget https://github.com/facebook/nailgun/archive/master.zip
$ unzip master.zip
$ cd nailgun-master
使用 Maven 编译服务器:
$ mvn clean install
...
[INFO] BUILD SUCCESS
...
编译客户端:
$ make
启动服务器:
$ java -jar nailgun-server/target/nailgun-server-1.0.0.jar &
NGServer 1.0.0 started on all addresses, port 2113.
运行客户端:
$ nailgun-client/target/ng ng-version
NailGun server version 1.0.0
但以下方法不起作用:
$ nailgun-client/target/ng ng-cp
(既没有输出也没有错误消息。)
$ cd ..
$ nailgun-master/nailgun-client/target/ng TestVarargs
(既没有输出也没有错误消息。)
$ nailgun-master/nailgun-client/target/ng ng-alias TV TestVarargs
(既没有输出也没有错误消息。)
停止命令正确运行:
$ nailgun-master/nailgun-client/target/ng ng-stop
NGServer shut down.
因此,总而言之,我可以安装并启动服务器。但我无法运行任何Java程序。