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‎.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎.gitignore

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build/
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bin/
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‎.project

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>java-config</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎build.xml

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<project name="java-config" default="dist">
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<target name="compile">
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<mkdir dir="build/classes"/>
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<javac srcdir="src" destdir="build/classes" includeantruntime="false"/>
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<copy todir="build/classes">
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<fileset dir="src">
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<include name="*.txt"/>
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</fileset>
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</copy>
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<exec executable = "git" output="build/classes/build.txt" failifexecutionfails="false" failonerror="false">
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<arg value = "rev-parse" />
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<arg value = "HEAD" />
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</exec>
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</target>
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<target name="jar" depends="compile">
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<jar jarfile="build/java-config.jar" basedir="build/classes">
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<manifest>
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<attribute name="Main-Class" value="JavaConfig"/>
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</manifest>
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</jar>
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</target>
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<target name="clean">
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<delete dir="build"/>
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</target>
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<target name="dist" depends="clean,jar">
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<copy todir="." file="build/java-config.jar"/>
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</target>
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</project>
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‎src/JavaConfig.java

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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.io.UnsupportedEncodingException;
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/**
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* Provide simple discovery of java compilation options similar
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* to package *-config programs installed with a lot of native software.
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* <p>
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* Most of this is derived from the system properties. An example is here:
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* <pre>
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java.runtime.name=OpenJDK Runtime Environment
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sun.boot.library.path=/usr/lib/jvm/java-6-openjdk/jre/lib/amd64
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java.vm.version=19.0-b09
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java.vm.vendor=Sun Microsystems Inc.
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java.vendor.url=http\://java.sun.com/
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path.separator=\:
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java.vm.name=OpenJDK 64-Bit Server VM
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file.encoding.pkg=sun.io
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sun.java.launcher=SUN_STANDARD
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user.country=US
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sun.os.patch.level=unknown
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java.vm.specification.name=Java Virtual Machine Specification
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user.dir=/home/stella/branches/java-config
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java.runtime.version=1.6.0_20-b20
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java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment
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java.endorsed.dirs=/usr/lib/jvm/java-6-openjdk/jre/lib/endorsed
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os.arch=amd64
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java.io.tmpdir=/tmp
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line.separator=\n
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java.vm.specification.vendor=Sun Microsystems Inc.
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os.name=Linux
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sun.jnu.encoding=UTF-8
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java.library.path=/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server\:/usr/lib/jvm/java-6-openjdk/jre/lib/amd64\:/usr/lib/jvm/java-6-openjdk/jre/../lib/amd64\:/usr/lib64/xulrunner-addons\:/usr/java/packages/lib/amd64\:/usr/lib/jni\:/lib\:/usr/lib
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java.specification.name=Java Platform API Specification
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java.class.version=50.0
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sun.management.compiler=HotSpot 64-Bit Server Compiler
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os.version=2.6.35-25-generic
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user.home=/home/stella
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user.timezone=America/Los_Angeles
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java.awt.printerjob=sun.print.PSPrinterJob
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file.encoding=UTF-8
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java.specification.version=1.6
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java.class.path=/home/stella/branches/java-config/bin
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user.name=stella
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java.vm.specification.version=1.0
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java.home=/usr/lib/jvm/java-6-openjdk/jre
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sun.arch.data.model=64
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user.language=en
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java.specification.vendor=Sun Microsystems Inc.
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java.vm.info=mixed mode
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java.version=1.6.0_20
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java.ext.dirs=/usr/lib/jvm/java-6-openjdk/jre/lib/ext\:/usr/java/packages/lib/ext
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sun.boot.class.path=/usr/lib/jvm/java-6-openjdk/jre/lib/resources.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/rt.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/sunrsasign.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/jsse.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/jce.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/charsets.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/netx.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/plugin.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/rhino.jar\:/usr/lib/jvm/java-6-openjdk/jre/lib/modules/jdk.boot.jar\:/usr/lib/jvm/java-6-openjdk/jre/classes
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java.vendor=Sun Microsystems Inc.
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file.separator=/
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java.vendor.url.bug=http\://java.sun.com/cgi-bin/bugreport.cgi
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sun.io.unicode.encoding=UnicodeLittle
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sun.cpu.endian=little
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sun.desktop=gnome
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sun.cpu.isalist=
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* </pre>
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* @author stella
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*
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*/
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public class JavaConfig {
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private String[] args;
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private StringWriter buffer;
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private PrintWriter out;
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public JavaConfig(String[] args) {
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this.args=args;
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this.buffer=new StringWriter();
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this.out=new PrintWriter(buffer);
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}
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private String readResource(String name) throws IOException {
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InputStream in=getClass().getResourceAsStream(name);
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if (in==null) return null;
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StringBuilder buffer=new StringBuilder();
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InputStreamReader reader=new InputStreamReader(in, "UTF-8");
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char[] b=new char[1024];
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for (;;) {
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int r=reader.read(b);
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if (r<0) break;
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buffer.append(b, 0, r);
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}
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return buffer.toString();
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}
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public void usage() throws IOException {
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String buildNumber=readResource("build.txt");
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if (buildNumber!=null) {
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System.err.println("java-config version " + buildNumber);
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} else {
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System.err.println("java-config unknown version");
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}
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System.err.print(readResource("usage.txt"));
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System.exit(2);
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}
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public void error(String msg) {
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System.err.println(msg);
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System.exit(2);
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}
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public void reportProp(String prop) {
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String value=System.getProperty(prop);
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if (value==null) {
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error("Expected system property " + prop + " but it was not found");
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}
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out.println(value);
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}
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private File getJdkHome() {
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String javaHome=System.getProperty("java.home");
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if (javaHome==null) return null;
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File jreDir=new File(javaHome);
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// Probe for jre within jdk
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if (!new File(jreDir, "include").isDirectory()) {
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if (jreDir.getName().equals("jre")) {
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return jreDir.getParentFile();
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}
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} else {
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return jreDir;
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}
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return null;
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}
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public void reportJdkHome() {
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File jdkDir=getJdkHome();
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if (jdkDir==null) error("Could not determine JDK location");
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out.println(jdkDir.getAbsolutePath());
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}
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public void reportCFlags() {
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File jdkDir=getJdkHome();
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if (jdkDir==null) error("Could not determine JDK location");
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StringBuilder flags=new StringBuilder();
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File incDir=new File(jdkDir, "include");
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if (!new File(incDir, "jni.h").exists()) error("Could not find jni.h in JDK include directory " + incDir);
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flags.append("-I").append(incDir.getAbsolutePath());
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// Scan for the platform specific directory. This is stupid.
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for (File child: incDir.listFiles()) {
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if (child.isDirectory() && new File(child, "jni_md.h").exists()) {
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flags.append(" -I").append(child.getAbsolutePath());
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}
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}
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out.println(flags.toString());
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}
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public void run() throws IOException {
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if (args.length==0) {
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usage();
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System.exit(1);
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}
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for (int i=0; i<args.length; i++) {
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String flag=args[i];
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flag=flag.replaceFirst("^\\-+", "").toLowerCase();
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if (flag.equals("home")) reportProp("java.home");
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else if (flag.equals("jdkhome")) reportJdkHome();
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else if (flag.equals("arch")) reportProp("os.arch");
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else if (flag.equals("version")) reportProp("java.version");
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else if (flag.equals("vmversion")) reportProp("java.vm.version");
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else if (flag.equals("specversion")) reportProp("java.specification.version");
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else if (flag.equals("runtimeversion")) reportProp("java.runtime.version");
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else if (flag.equals("osversion")) reportProp("os.version");
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else if (flag.equals("osname")) reportProp("os.name");
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else if (flag.equals("datamodel")) reportProp("sun.arch.data.model");
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else if (flag.equals("endian")) reportProp("sun.cpu.endian");
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else if (flag.equals("language")) reportProp("user.language");
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else if (flag.equals("cflags")) reportCFlags();
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}
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out.flush();
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System.out.print(buffer.toString());
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}
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public static void main(String[] args) throws Exception {
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JavaConfig m=new JavaConfig(args);
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m.run();
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}
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}

‎src/usage.txt

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Syntax: java -jar java-config.jar [FLAGS]
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Flags:
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--home Java Home
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--jdkhome JDK home (discovered by heuristic)
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--arch JRE architecture (ie. amd64)
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--version Java version
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--vmversion Virtual machine version
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--specversion Java specification version (ie. 1.6)
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--runtimeversion Runtime version
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--osversion Operating System version
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--osname Operating System name (ie. Linux)
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--datamodel JRE data model (ie. 32 or 64)
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--endian System endian-ness (ie. little or big)
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--cflags CFLAGS to use when compiling a JNI library
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--ldflags LDFLAGS to use when linking to the jvm
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