如何使用客户端/服务器Nailgun(在Debian Stretch上)运行简单的Java程序?

时间:2018-11-18 18:02:10

标签: java jvm debian debian-stretch nailgun

我尝试在 Debian GNU / Linux 9(拉伸)上使用 Nailgun

“ Nailgun是一个客户端,协议和服务器,可从命令行运行Java程序而不会引起JVM启动开销。程序在服务器(以Java实现)中运行,并由客户端触发(以C),处理所有I / O。“

找到了一些文档:

我使用 Oracle Java版本10.0.2 (我也尝试使用GraalVM 1.0.0-rc9 Java 1.8.0_192)。

一个简单的Java程序进行测试: TestVarargs.java。 (最后,我想运行一个JAR文件,但是我尝试了这个简单的示例,因为它不起作用。)

$ wget https://bitbucket.org/OPiMedia/hellanguages/raw/default/Java/standard/TestVarargs/TestVarargs.java
$ javac TestVarargs.java
$ java TestVarargs

该程序正常运行。

首先尝试使用Debian nailgun package(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

但是以下操作无效:

$ 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)

stop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 sources开始构建

$ 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

但是以下操作无效:

$ nailgun-client/target/ng ng-cp

(既不输出也不显示错误消息。)

$ cd ..
$ nailgun-master/nailgun-client/target/ng TestVarargs

(既不输出也不显示错误消息。)

$ nailgun-master/nailgun-client/target/ng ng-alias TV TestVarargs

(既不输出也不显示错误消息。)

stop命令正确运行:

$ nailgun-master/nailgun-client/target/ng ng-stop
NGServer shut down.

因此,总而言之,我可以安装和启动服务器。但是我无法运行任何Java程序。

1 个答案:

答案 0 :(得分:1)

假设您的HelloWorld.class位于以下目录中:

/home/28041/ng-sample/com/crazyboy/HelloWorld.class

在运行该类之前,您需要使用以下命令来告知该类的位置:

ng ng-cp /home/28041/ng-sample

然后

ng com.crazyboy.HelloWorld