Ant example source code file (Java.java)
The Java.java source code
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.taskdefs;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ExitException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.ExitStatusException;
import org.apache.tools.ant.types.Commandline;
import org.apache.tools.ant.types.CommandlineJava;
import org.apache.tools.ant.types.Environment;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.PropertySet;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.types.Assertions;
import org.apache.tools.ant.types.Permissions;
import org.apache.tools.ant.types.RedirectorElement;
import org.apache.tools.ant.taskdefs.condition.Os;
import org.apache.tools.ant.util.KeepAliveInputStream;
/**
* Launcher for Java applications. Allows use of
* the same JVM for the called application thus resulting in much
* faster operation.
*
* @since Ant 1.1
*
* @ant.task category="java"
*/
public class Java extends Task {
private CommandlineJava cmdl = new CommandlineJava();
private Environment env = new Environment();
private boolean fork = false;
private boolean newEnvironment = false;
private File dir = null;
private boolean failOnError = false;
private Long timeout = null;
//include locally for screening purposes
private String inputString;
private File input;
private File output;
private File error;
// CheckStyle:VisibilityModifier OFF - bc
protected Redirector redirector = new Redirector(this);
protected RedirectorElement redirectorElement;
// CheckStyle:VisibilityModifier ON
private String resultProperty;
private Permissions perm = null;
private boolean spawn = false;
private boolean incompatibleWithSpawn = false;
/**
* Normal constructor
*/
public Java() {
}
/**
* create a bound task
* @param owner owner
*/
public Java(Task owner) {
bindToOwner(owner);
}
/**
* Do the execution.
* @throws BuildException if failOnError is set to true and the application
* returns a nonzero result code.
*/
public void execute() throws BuildException {
File savedDir = dir;
Permissions savedPermissions = perm;
int err = -1;
try {
err = executeJava();
if (err != 0) {
if (failOnError) {
throw new ExitStatusException("Java returned: " + err,
err,
getLocation());
} else {
log("Java Result: " + err, Project.MSG_ERR);
}
}
maybeSetResultPropertyValue(err);
} finally {
dir = savedDir;
perm = savedPermissions;
}
}
/**
* Do the execution and return a return code.
*
* @return the return code from the execute java class if it was
* executed in a separate VM (fork = "yes") or a security manager was
* installed that prohibits ExitVM (default).
*
* @throws BuildException if required parameters are missing.
*/
public int executeJava() throws BuildException {
String classname = getCommandLine().getClassname();
if (classname == null && getCommandLine().getJar() == null) {
throw new BuildException("Classname must not be null.");
}
if (!fork && getCommandLine().getJar() != null) {
throw new BuildException("Cannot execute a jar in non-forked mode."
+ " Please set fork='true'. ");
}
if (spawn && !fork) {
throw new BuildException("Cannot spawn a java process in non-forked mode."
+ " Please set fork='true'. ");
}
if (getCommandLine().getClasspath() != null
&& getCommandLine().getJar() != null) {
log("When using 'jar' attribute classpath-settings are ignored. "
+ "See the manual for more information.", Project.MSG_VERBOSE);
}
if (spawn && incompatibleWithSpawn) {
getProject().log("spawn does not allow attributes related to input, "
+ "output, error, result", Project.MSG_ERR);
getProject().log("spawn also does not allow timeout", Project.MSG_ERR);
getProject().log("finally, spawn is not compatible "
+ "with a nested I/O <redirector>", Project.MSG_ERR);
throw new BuildException("You have used an attribute "
+ "or nested element which is not compatible with spawn");
}
if (getCommandLine().getAssertions() != null && !fork) {
log("Assertion statements are currently ignored in non-forked mode");
}
if (fork) {
if (perm != null) {
log("Permissions can not be set this way in forked mode.", Project.MSG_WARN);
}
log(getCommandLine().describeCommand(), Project.MSG_VERBOSE);
} else {
if (getCommandLine().getVmCommand().size() > 1) {
log("JVM args ignored when same JVM is used.",
Project.MSG_WARN);
}
if (dir != null) {
log("Working directory ignored when same JVM is used.",
Project.MSG_WARN);
}
if (newEnvironment || null != env.getVariables()) {
log("Changes to environment variables are ignored when same "
+ "JVM is used.", Project.MSG_WARN);
}
if (getCommandLine().getBootclasspath() != null) {
log("bootclasspath ignored when same JVM is used.",
Project.MSG_WARN);
}
if (perm == null) {
perm = new Permissions(true);
log("running " + this.getCommandLine().getClassname()
+ " with default permissions (exit forbidden)", Project.MSG_VERBOSE);
}
log("Running in same VM " + getCommandLine().describeJavaCommand(),
Project.MSG_VERBOSE);
}
setupRedirector();
try {
if (fork) {
if (!spawn) {
return fork(getCommandLine().getCommandline());
} else {
spawn(getCommandLine().getCommandline());
return 0;
}
} else {
try {
run(getCommandLine());
return 0;
} catch (ExitException ex) {
return ex.getStatus();
}
}
} catch (BuildException e) {
if (e.getLocation() == null && getLocation() != null) {
e.setLocation(getLocation());
}
if (failOnError) {
throw e;
} else {
log(e);
return 0;
}
} catch (ThreadDeath t) {
throw t; // cf. NB #47191
} catch (Throwable t) {
if (failOnError) {
throw new BuildException(t, getLocation());
} else {
log(t);
return 0;
}
}
}
/**
* Set whether or not you want the process to be spawned;
* default is not spawned.
* @param spawn if true you do not want Ant to wait for the end of the process.
* @since Ant 1.6
*/
public void setSpawn(boolean spawn) {
this.spawn = spawn;
}
/**
* Set the classpath to be used when running the Java class.
*
* @param s an Ant Path object containing the classpath.
*/
public void setClasspath(Path s) {
createClasspath().append(s);
}
/**
* Add a path to the classpath.
*
* @return created classpath.
*/
public Path createClasspath() {
return getCommandLine().createClasspath(getProject()).createPath();
}
/**
* Add a path to the bootclasspath.
* @since Ant 1.6
*
* @return created bootclasspath.
*/
public Path createBootclasspath() {
return getCommandLine().createBootclasspath(getProject()).createPath();
}
/**
* Set the permissions for the application run inside the same JVM.
* @since Ant 1.6
* @return Permissions.
*/
public Permissions createPermissions() {
perm = (perm == null) ? new Permissions() : perm;
return perm;
}
/**
* Set the classpath to use by reference.
*
* @param r a reference to an existing classpath.
*/
public void setClasspathRef(Reference r) {
createClasspath().setRefid(r);
}
/**
* Set the location of the JAR file to execute.
*
* @param jarfile the jarfile to execute.
*
* @throws BuildException if there is also a main class specified.
*/
public void setJar(File jarfile) throws BuildException {
if (getCommandLine().getClassname() != null) {
throw new BuildException("Cannot use 'jar' and 'classname' "
+ "attributes in same command.");
}
getCommandLine().setJar(jarfile.getAbsolutePath());
}
/**
* Set the Java class to execute.
*
* @param s the name of the main class.
*
* @throws BuildException if the jar attribute has been set.
*/
public void setClassname(String s) throws BuildException {
if (getCommandLine().getJar() != null) {
throw new BuildException("Cannot use 'jar' and 'classname' "
+ "attributes in same command");
}
getCommandLine().setClassname(s);
}
/**
* Deprecated: use nested arg instead.
* Set the command line arguments for the class.
*
* @param s arguments.
*
* @ant.attribute ignore="true"
*/
public void setArgs(String s) {
log("The args attribute is deprecated. "
+ "Please use nested arg elements.", Project.MSG_WARN);
getCommandLine().createArgument().setLine(s);
}
/**
* If set, system properties will be copied to the cloned VM--as
* well as the bootclasspath unless you have explicitly specified
* a bootclaspath.
*
* <p>Doesn't have any effect unless fork is true.
* @param cloneVm if true copy system properties.
* @since Ant 1.7
*/
public void setCloneVm(boolean cloneVm) {
getCommandLine().setCloneVm(cloneVm);
}
/**
* Add a command-line argument.
*
* @return created argument.
*/
public Commandline.Argument createArg() {
return getCommandLine().createArgument();
}
/**
* Set the name of the property in which the return code of the
* command should be stored. Only of interest if failonerror=false.
*
* @param resultProperty name of property.
*
* @since Ant 1.6
*/
public void setResultProperty(String resultProperty) {
this.resultProperty = resultProperty;
incompatibleWithSpawn = true;
}
/**
* Helper method to set result property to the
* passed in value if appropriate.
*
* @param result the exit code
*/
protected void maybeSetResultPropertyValue(int result) {
String res = Integer.toString(result);
if (resultProperty != null) {
getProject().setNewProperty(resultProperty, res);
}
}
/**
* If true, execute in a new VM.
*
* @param s do you want to run Java in a new VM.
*/
public void setFork(boolean s) {
this.fork = s;
}
/**
* Set the command line arguments for the JVM.
*
* @param s jvmargs.
*/
public void setJvmargs(String s) {
log("The jvmargs attribute is deprecated. "
+ "Please use nested jvmarg elements.", Project.MSG_WARN);
getCommandLine().createVmArgument().setLine(s);
}
/**
* Adds a JVM argument.
*
* @return JVM argument created.
*/
public Commandline.Argument createJvmarg() {
return getCommandLine().createVmArgument();
}
/**
* Set the command used to start the VM (only if forking).
*
* @param s command to start the VM.
*/
public void setJvm(String s) {
getCommandLine().setVm(s);
}
/**
* Add a system property.
*
* @param sysp system property.
*/
public void addSysproperty(Environment.Variable sysp) {
getCommandLine().addSysproperty(sysp);
}
/**
* Add a set of properties as system properties.
*
* @param sysp set of properties to add.
*
* @since Ant 1.6
*/
public void addSyspropertyset(PropertySet sysp) {
getCommandLine().addSyspropertyset(sysp);
}
/**
* If true, then fail if the command exits with a
* returncode other than zero.
*
* @param fail if true fail the build when the command exits with a
* nonzero returncode.
*/
public void setFailonerror(boolean fail) {
failOnError = fail;
incompatibleWithSpawn |= fail;
}
/**
* Set the working directory of the process.
*
* @param d working directory.
*
*/
public void setDir(File d) {
this.dir = d;
}
/**
* Set the File to which the output of the process is redirected.
*
* @param out the output File.
*/
public void setOutput(File out) {
this.output = out;
incompatibleWithSpawn = true;
}
/**
* Set the input to use for the task.
*
* @param input name of the input file.
*/
public void setInput(File input) {
if (inputString != null) {
throw new BuildException("The \"input\" and \"inputstring\" "
+ "attributes cannot both be specified");
}
this.input = input;
incompatibleWithSpawn = true;
}
/**
* Set the string to use as input.
*
* @param inputString the string which is used as the input source.
*/
public void setInputString(String inputString) {
if (input != null) {
throw new BuildException("The \"input\" and \"inputstring\" "
+ "attributes cannot both be specified");
}
this.inputString = inputString;
incompatibleWithSpawn = true;
}
/**
* Set whether error output of exec is logged. This is only useful
* when output is being redirected and error output is desired in the
* Ant log.
*
* @param logError get in the ant log the messages coming from stderr
* in the case that fork = true.
*/
public void setLogError(boolean logError) {
redirector.setLogError(logError);
incompatibleWithSpawn |= logError;
}
/**
* Set the File to which the error stream of the process is redirected.
*
* @param error file getting the error stream.
*
* @since Ant 1.6
*/
public void setError(File error) {
this.error = error;
incompatibleWithSpawn = true;
}
/**
* Set the property name whose value should be set to the output of
* the process.
*
* @param outputProp property name.
*
*/
public void setOutputproperty(String outputProp) {
redirector.setOutputProperty(outputProp);
incompatibleWithSpawn = true;
}
/**
* Set the property name whose value should be set to the error of
* the process.
*
* @param errorProperty property name.
*
* @since Ant 1.6
*/
public void setErrorProperty(String errorProperty) {
redirector.setErrorProperty(errorProperty);
incompatibleWithSpawn = true;
}
/**
* Corresponds to -mx or -Xmx depending on VM version.
*
* @param max max memory parameter.
*/
public void setMaxmemory(String max) {
getCommandLine().setMaxmemory(max);
}
/**
* Set the JVM version.
* @param value JVM version.
*/
public void setJVMVersion(String value) {
getCommandLine().setVmversion(value);
}
/**
* Add an environment variable.
*
* <p>Will be ignored if we are not forking a new VM.
*
* @param var new environment variable.
*
* @since Ant 1.5
*/
public void addEnv(Environment.Variable var) {
env.addVariable(var);
}
/**
* If true, use a completely new environment.
*
* <p>Will be ignored if we are not forking a new VM.
*
* @param newenv if true, use a completely new environment.
*
* @since Ant 1.5
*/
public void setNewenvironment(boolean newenv) {
newEnvironment = newenv;
}
/**
* If true, append output to existing file.
*
* @param append if true, append output to existing file.
*
* @since Ant 1.5
*/
public void setAppend(boolean append) {
redirector.setAppend(append);
incompatibleWithSpawn = true;
}
/**
* Set the timeout in milliseconds after which the process will be killed.
*
* @param value timeout in milliseconds.
*
* @since Ant 1.5
*/
public void setTimeout(Long value) {
timeout = value;
incompatibleWithSpawn |= timeout != null;
}
/**
* Add assertions to enable in this program (if fork=true).
* @param asserts assertion set.
* @since Ant 1.6
*/
public void addAssertions(Assertions asserts) {
if (getCommandLine().getAssertions() != null) {
throw new BuildException("Only one assertion declaration is allowed");
}
getCommandLine().setAssertions(asserts);
}
/**
* Add a <code>RedirectorElement to this task.
* @param redirectorElement <code>RedirectorElement.
*/
public void addConfiguredRedirector(RedirectorElement redirectorElement) {
if (this.redirectorElement != null) {
throw new BuildException("cannot have > 1 nested redirectors");
}
this.redirectorElement = redirectorElement;
incompatibleWithSpawn = true;
}
/**
* Pass output sent to System.out to specified output file.
*
* @param output a string of output on its way to the handlers.
*
* @since Ant 1.5
*/
protected void handleOutput(String output) {
if (redirector.getOutputStream() != null) {
redirector.handleOutput(output);
} else {
super.handleOutput(output);
}
}
/**
* Handle an input request by this task.
*
* @param buffer the buffer into which data is to be read.
* @param offset the offset into the buffer at which data is stored.
* @param length the amount of data to read.
*
* @return the number of bytes read.
*
* @exception IOException if the data cannot be read.
* @since Ant 1.6
*/
public int handleInput(byte[] buffer, int offset, int length)
throws IOException {
// Should work whether or not redirector.inputStream == null:
return redirector.handleInput(buffer, offset, length);
}
/**
* Pass output sent to System.out to specified output file.
*
* @param output string of output on its way to its handlers.
*
* @since Ant 1.5.2
*/
protected void handleFlush(String output) {
if (redirector.getOutputStream() != null) {
redirector.handleFlush(output);
} else {
super.handleFlush(output);
}
}
/**
* Handle output sent to System.err.
*
* @param output string of stderr.
*
* @since Ant 1.5
*/
protected void handleErrorOutput(String output) {
if (redirector.getErrorStream() != null) {
redirector.handleErrorOutput(output);
} else {
super.handleErrorOutput(output);
}
}
/**
* Handle output sent to System.err and flush the stream.
*
* @param output string of stderr.
*
* @since Ant 1.5.2
*/
protected void handleErrorFlush(String output) {
if (redirector.getErrorStream() != null) {
redirector.handleErrorFlush(output);
} else {
super.handleErrorOutput(output);
}
}
/**
* Set up properties on the redirector that we needed to store locally.
*/
protected void setupRedirector() {
redirector.setInput(input);
redirector.setInputString(inputString);
redirector.setOutput(output);
redirector.setError(error);
if (redirectorElement != null) {
redirectorElement.configure(redirector);
}
if (!spawn && input == null && inputString == null) {
// #24918: send standard input to the process by default.
redirector.setInputStream(
new KeepAliveInputStream(getProject().getDefaultInputStream()));
}
}
/**
* Executes the given classname with the given arguments as it
* were a command line application.
* @param command CommandlineJava.
*/
private void run(CommandlineJava command) throws BuildException {
try {
ExecuteJava exe = new ExecuteJava();
exe.setJavaCommand(command.getJavaCommand());
exe.setClasspath(command.getClasspath());
exe.setSystemProperties(command.getSystemProperties());
exe.setPermissions(perm);
exe.setTimeout(timeout);
redirector.createStreams();
exe.execute(getProject());
redirector.complete();
if (exe.killedProcess()) {
throw new BuildException("Timeout: killed the sub-process");
}
} catch (IOException e) {
throw new BuildException(e);
}
}
/**
* Executes the given classname with the given arguments in a separate VM.
* @param command String[] of command-line arguments.
*/
private int fork(String[] command) throws BuildException {
Execute exe
= new Execute(redirector.createHandler(), createWatchdog());
setupExecutable(exe, command);
try {
int rc = exe.execute();
redirector.complete();
if (exe.killedProcess()) {
throw new BuildException("Timeout: killed the sub-process");
}
return rc;
} catch (IOException e) {
throw new BuildException(e, getLocation());
}
}
/**
* Executes the given classname with the given arguments in a separate VM.
* @param command String[] of command-line arguments.
*/
private void spawn(String[] command) throws BuildException {
Execute exe = new Execute();
setupExecutable(exe, command);
try {
exe.spawn();
} catch (IOException e) {
throw new BuildException(e, getLocation());
}
}
/**
* Do all configuration for an executable that
* is common across the {@link #fork(String[])} and
* {@link #spawn(String[])} methods.
* @param exe executable.
* @param command command to execute.
*/
private void setupExecutable(Execute exe, String[] command) {
exe.setAntRun(getProject());
setupWorkingDir(exe);
setupEnvironment(exe);
setupCommandLine(exe, command);
}
/**
* Set up our environment variables.
* @param exe executable.
*/
private void setupEnvironment(Execute exe) {
String[] environment = env.getVariables();
if (environment != null) {
for (int i = 0; i < environment.length; i++) {
log("Setting environment variable: " + environment[i],
Project.MSG_VERBOSE);
}
}
exe.setNewenvironment(newEnvironment);
exe.setEnvironment(environment);
}
/**
* Set the working dir of the new process.
* @param exe executable.
* @throws BuildException if the dir doesn't exist.
*/
private void setupWorkingDir(Execute exe) {
if (dir == null) {
dir = getProject().getBaseDir();
} else if (!dir.exists() || !dir.isDirectory()) {
throw new BuildException(dir.getAbsolutePath()
+ " is not a valid directory",
getLocation());
}
exe.setWorkingDirectory(dir);
}
/**
* Set the command line for the exe.
* On VMS, hands off to {@link #setupCommandLineForVMS(Execute, String[])}.
* @param exe executable.
* @param command command to execute.
*/
private void setupCommandLine(Execute exe, String[] command) {
//On VMS platform, we need to create a special java options file
//containing the arguments and classpath for the java command.
//The special file is supported by the "-V" switch on the VMS JVM.
if (Os.isFamily("openvms")) {
setupCommandLineForVMS(exe, command);
} else {
exe.setCommandline(command);
}
}
/**
* On VMS platform, we need to create a special java options file
* containing the arguments and classpath for the java command.
* The special file is supported by the "-V" switch on the VMS JVM.
*
* @param exe executable.
* @param command command to execute.
*/
private void setupCommandLineForVMS(Execute exe, String[] command) {
ExecuteJava.setupCommandLineForVMS(exe, command);
}
/**
* Executes the given classname with the given arguments as if it
* were a command line application.
*
* @param classname the name of the class to run.
* @param args arguments for the class.
* @throws BuildException in case of IOException in the execution.
*/
protected void run(String classname, Vector args) throws BuildException {
CommandlineJava cmdj = new CommandlineJava();
cmdj.setClassname(classname);
for (int i = 0; i < args.size(); i++) {
cmdj.createArgument().setValue((String) args.elementAt(i));
}
run(cmdj);
}
/**
* Clear out the arguments to this java task.
*/
public void clearArgs() {
getCommandLine().clearJavaArgs();
}
/**
* Create the Watchdog to kill a runaway process.
*
* @return new watchdog.
*
* @throws BuildException under unknown circumstances.
*
* @since Ant 1.5
*/
protected ExecuteWatchdog createWatchdog() throws BuildException {
if (timeout == null) {
return null;
}
return new ExecuteWatchdog(timeout.longValue());
}
/**
* Log the specified Throwable.
* @param t the Throwable to log.
* @since 1.6.2
*/
private void log(Throwable t) {
StringWriter sw = new StringWriter();
PrintWriter w = new PrintWriter(sw);
t.printStackTrace(w);
w.close();
log(sw.toString(), Project.MSG_ERR);
}
/**
* Accessor to the command line.
*
* @return the current command line.
* @since 1.6.3
*/
public CommandlineJava getCommandLine() {
return cmdl;
}
/**
* Get the system properties of the command line.
*
* @return the current properties of this java invocation.
* @since 1.6.3
*/
public CommandlineJava.SysProperties getSysProperties() {
return getCommandLine().getSystemProperties();
}
}
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