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| 2 |
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| 3 | <head>
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| 4 | <meta http-equiv="Content-Language" content="en-us">
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| 5 | <title>Java Task</title>
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| 6 | <link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css">
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| 7 | </head>
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| 8 |
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| 9 | <body>
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| 10 |
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| 11 | <h2><a name="java">Java</a></h2>
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| 12 | <h3>Description</h3>
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| 13 | <p>Executes a Java class within the running (Ant) VM or forks another VM if
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| 14 | specified.</p>
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| 15 | <p>
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| 16 | If odd things go wrong when you run this task, set fork="true" to use a new
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| 17 | JVM.
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| 18 |
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| 19 | <p>Note that you cannot interact with a forked VM, the only way to
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| 20 | send input to it is via the input and inputstring attributes. Also note that
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| 21 | in Ant 1.6, any attempt to read input in the forked VM will receive an
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| 22 | EOF (-1). This is a change from Ant 1.5, where such an attempt would block.</p>
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| 23 |
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| 24 | <h3>Parameters</h3>
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| 25 | <table border="1" cellpadding="2" cellspacing="0">
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| 26 | <tr>
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| 27 | <td valign="top"><b>Attribute</b></td>
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| 28 | <td valign="top"><b>Description</b></td>
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| 29 | <td align="center" valign="top"><b>Required</b></td>
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| 30 | </tr>
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| 31 | <tr>
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| 32 | <td valign="top">classname</td>
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| 33 | <td valign="top">the Java class to execute.</td>
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| 34 | <td align="center" valign="top">Either jar or classname</td>
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| 35 | </tr>
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| 36 | <tr>
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| 37 | <td valign="top">jar</td>
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| 38 | <td valign="top">the location of the jar file to execute (must have a
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| 39 | Main-Class entry in the manifest). Fork must be set to true if this option is selected.</td>
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| 40 | <td align="center" valign="top">Either jar or classname</td>
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| 41 | </tr>
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| 42 | <tr>
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| 43 | <td valign="top">args</td>
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| 44 | <td valign="top">the arguments for the class that is
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| 45 | executed. <b>deprecated, use nested <code><arg></code>
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| 46 | elements instead.</b></td>
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| 47 | <td align="center" valign="top">No</td>
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| 48 | </tr>
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| 49 | <tr>
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| 50 | <td valign="top">classpath</td>
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| 51 | <td valign="top">the classpath to use.</td>
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| 52 | <td align="center" valign="top">No</td>
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| 53 | </tr>
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| 54 | <tr>
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| 55 | <td valign="top">classpathref</td>
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| 56 | <td valign="top">the classpath to use, given as <a
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| 57 | href="../using.html#references">reference</a> to a PATH defined elsewhere.</td>
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| 58 | <td align="center" valign="top">No</td>
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| 59 | </tr>
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| 60 | <tr>
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| 61 | <td valign="top">fork</td>
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| 62 | <td valign="top">if enabled triggers the class execution in another VM
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| 63 | (disabled by default)</td>
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| 64 | <td align="center" valign="top">No</td>
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| 65 | </tr>
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| 66 | <tr>
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| 67 | <td valign="top">spawn</td>
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| 68 | <td valign="top">if enabled allows to start a process which will outlive ant.<br/>
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| 69 | Requires fork=true, and not compatible
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| 70 | with timeout, input, output, error, result attributes.<br/>
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| 71 | (disabled by default)</td>
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| 72 | <td align="center" valign="top">No</td>
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| 73 | </tr>
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| 74 | <tr>
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| 75 | <td valign="top">jvm</td>
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| 76 | <td valign="top">the command used to invoke the Java Virtual Machine,
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| 77 | default is 'java'. The command is resolved by java.lang.Runtime.exec().
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| 78 | Ignored if fork is disabled.
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| 79 | </td>
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| 80 | <td align="center" valign="top">No</td>
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| 81 | </tr>
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| 82 | <tr>
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| 83 | <td valign="top">jvmargs</td>
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| 84 | <td valign="top">the arguments to pass to the forked VM (ignored
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| 85 | if fork is disabled). <b>deprecated, use nested
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| 86 | <code><jvmarg></code> elements instead.</b></td>
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| 87 | <td align="center" valign="top">No</td>
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| 88 | </tr>
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| 89 | <tr>
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| 90 | <td valign="top">maxmemory</td>
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| 91 | <td valign="top">Max amount of memory to allocate to the forked VM
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| 92 | (ignored if fork is disabled)</td>
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| 93 | <td align="center" valign="top">No</td>
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| 94 | </tr>
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| 95 | <tr>
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| 96 | <td valign="top">failonerror</td>
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| 97 | <td valign="top">Stop the buildprocess if the command exits with a
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| 98 | returncode other than 0. Default is "false" (see <a href="#failonerror">note</a>)</td>
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| 99 | <td align="center" valign="top">No</td>
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| 100 | </tr>
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| 101 | <tr>
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| 102 | <td valign="top">resultproperty</td>
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| 103 | <td valign="top">The name of a property in which the return code of the
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| 104 | command should be stored. Only of interest if failonerror=false
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| 105 | and if fork=true.</td>
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| 106 | <td align="center" valign="top">No</td>
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| 107 | </tr>
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| 108 | <tr>
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| 109 | <td valign="top">dir</td>
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| 110 | <td valign="top">The directory to invoke the VM in. (ignored if
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| 111 | fork is disabled)</td>
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| 112 | <td align="center" valign="top">No</td>
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| 113 | </tr>
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| 114 | <tr>
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| 115 | <td valign="top">output</td>
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| 116 | <td valign="top">Name of a file to which to write the output. If the error stream
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| 117 | is not also redirected to a file or property, it will appear in this output.</td>
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| 118 | <td align="center" valign="top">No</td>
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| 119 | </tr>
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| 120 | <tr>
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| 121 | <td valign="top">error</td>
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| 122 | <td valign="top">The file to which the standard error of the command should be
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| 123 | redirected. </td>
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| 124 | <td align="center" valign="top">No</td>
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| 125 | </tr>
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| 126 | <tr>
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| 127 | <td valign="top">logError</td>
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| 128 | <td valign="top">This attribute is used when you wish to see error output in Ant's
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| 129 | log and you are redirecting output to a file/property. The error
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| 130 | output will not be included in the output file/property. If you
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| 131 | redirect error with the "error" or "errorProperty"
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| 132 | attributes, this will have no effect.</td>
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| 133 | <td align="center" valign="top">No</td>
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| 134 | </tr>
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| 135 | <tr>
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| 136 | <td valign="top">append</td>
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| 137 | <td valign="top">Whether output and error files should be appended to or overwritten.
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| 138 | Defaults to false.</td>
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| 139 | <td align="center" valign="top">No</td>
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| 140 | </tr>
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| 141 | <tr>
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| 142 | <td valign="top">outputproperty</td>
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| 143 | <td valign="top">The name of a property in which the output of the
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| 144 | command should be stored. Unless the error stream is redirected to a separate
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| 145 | file or stream, this property will include the error output.</td>
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| 146 | <td align="center" valign="top">No</td>
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| 147 | </tr>
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| 148 | <tr>
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| 149 | <td valign="top">errorproperty</td>
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| 150 | <td valign="top">The name of a property in which the standard error of the
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| 151 | command should be stored.</td>
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| 152 | <td align="center" valign="top">No</td>
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| 153 | </tr>
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| 154 | <tr>
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| 155 | <td valign="top">input</td>
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| 156 | <td valign="top">A file from which the executed command's standard input
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| 157 | is taken. This attribute is mutually exclusive with the
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| 158 | inputstring attribute</td>
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| 159 | <td align="center" valign="top">No</td>
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| 160 | </tr>
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| 161 | <tr>
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| 162 | <td valign="top">inputstring</td>
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| 163 | <td valign="top">A string which serves as the input stream for the
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| 164 | executed command. This attribute is mutually exclusive with the
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| 165 | input attribute.</td>
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| 166 | <td align="center" valign="top">No</td>
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| 167 | </tr>
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| 168 | <tr>
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| 169 | <td valign="top">newenvironment</td>
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| 170 | <td valign="top">Do not propagate old environment when new
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| 171 | environment variables are specified. Default is "false"
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| 172 | (ignored if fork is disabled).</td>
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| 173 | <td align="center" valign="top">No</td>
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| 174 | </tr>
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| 175 | <tr>
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| 176 | <td valign="top">timeout</td>
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| 177 | <td valign="top">Stop the command if it doesn't finish within the
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| 178 | specified time (given in milliseconds). <strong>It is highly
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| 179 | recommended to use this feature only if fork is enabled.</strong></td>
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| 180 | <td align="center" valign="top">No</td>
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| 181 | </tr>
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| 182 | </table>
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| 183 | <h3>Parameters specified as nested elements</h3>
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| 184 | <h4>arg and jvmarg</h4>
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| 185 | <p>Use nested <code><arg></code> and <code><jvmarg></code>
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| 186 | elements to specify arguments for the Java class and the forked VM respectively.
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| 187 | See <a href="../using.html#arg">Command line arguments</a>.</p>
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| 188 | <h4>sysproperty</h4>
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| 189 | <p>Use nested <code><sysproperty></code>
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| 190 | elements to specify system properties required by the class.
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| 191 | These properties will be made available to the VM during the execution
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| 192 | of the class (either ANT's VM or the forked VM). The attributes
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| 193 | for this element are the same as for <a href="exec.html#env">environment
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| 194 | variables</a>.</p>
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| 195 |
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| 196 | <h4>syspropertyset</h4>
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| 197 |
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| 198 | <p>You can specify a set of properties to be used as system properties
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| 199 | with <a href="../CoreTypes/propertyset.html">syspropertyset</a>s.</p>
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| 200 |
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| 201 | <p><em>since Ant 1.6</em>.</p>
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| 202 |
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| 203 | <h4>classpath</h4>
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| 204 | <p><code>Java</code>'s <i>classpath</i> attribute is a <a
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| 205 | href="../using.html#path">PATH like structure</a> and can also be set via a nested
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| 206 | <i>classpath</i> element.</p>
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| 207 |
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| 208 | <h4>bootclasspath</h4>
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| 209 |
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| 210 | <p>The location of bootstrap class files can be specified using this
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| 211 | <a href="../using.html#path">PATH like structure</a> - will be ignored
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| 212 | if <i>fork</i> is not <code>true</code> or the target VM doesn't
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| 213 | support it (i.e. Java 1.1).</p>
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| 214 |
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| 215 | <p><em>since Ant 1.6</em>.</p>
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| 216 |
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| 217 | <h4>env</h4>
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| 218 | <p>It is possible to specify environment variables to pass to the
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| 219 | forked VM via nested <i>env</i> elements. See the description in the
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| 220 | section about <a href="exec.html#env">exec</a></p>
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| 221 | <p>Settings will be ignored if fork is disabled.</p>
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| 222 |
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| 223 | <h4>permissions</h4>
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| 224 | <p>Security permissions can be revoked and granted during the execution of the
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| 225 | class via a nested <i>permissions</i> element. For more information please
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| 226 | see <a href="../CoreTypes/permissions.html">permissions</a></p>
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| 227 | <p>When the permission RuntimePermission exitVM has not been granted (or has
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| 228 | been revoked) the System.exit() call will be intercepted
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| 229 | and treated like indicated in <i>failonerror</i>.</p>
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| 230 | <p><a name="failonerror">Note:</a>
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| 231 | if you specify <code>failonerror="true"</code> and you do not specify permissions,
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| 232 | a set of default permissions will be added to your Java invocation to make sure that
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| 233 | a non-zero return code will lead to a <code>BuildException</code>.
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| 234 | </p>
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| 235 | <p>Settings will be ignored if fork is enabled.</p>
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| 236 |
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| 237 | <p><em>since Ant 1.6</em>.</p>
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| 238 |
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| 239 | <h4>assertions</h4>
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| 240 |
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| 241 | <p>You can control enablement of Java 1.4 assertions with an
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| 242 | <a href="../CoreTypes/assertions.html"><tt><assertions></tt></a>
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| 243 | subelement.</p>
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| 244 |
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| 245 | <p>Assertion statements are currently ignored in non-forked mode.</p>
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| 246 |
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| 247 | <p><em>since Ant 1.6.</em></p>
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| 248 |
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| 249 | <a name="redirector"></a><h4>redirector</h4>
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| 250 | <i><b>Since Ant 1.6.2</b></i>
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| 251 | <p>A nested <a href="../CoreTypes/redirector.html">I/O Redirector</a>
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| 252 | can be specified. In general, the attributes of the redirector behave
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| 253 | as the corresponding attributes available at the task level. The most
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| 254 | notable peculiarity stems from the retention of the <java>
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| 255 | attributes for backwards compatibility. Any file mapping is done
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| 256 | using a <CODE>null</CODE> sourcefile; therefore not all
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| 257 | <a href="../CoreTypes/mapper.html">Mapper</a> types will return
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| 258 | results. When no results are returned, redirection specifications
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| 259 | will fall back to the task level attributes. In practice this means that
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| 260 | defaults can be specified for input, output, and error output files.
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| 261 | </p>
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| 262 | <h3>Errors and return codes</h3>
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| 263 | By default the return code of a <java> is ignored. Alternatively, you can set <code>resultproperty</code> to the name
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| 264 | of a property and have it assigned to the result code (barring immutability,
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| 265 | of course).
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| 266 | When you set <code>failonerror="true"</code>, the only possible value for <code>resultproperty</code> is 0. Any non zero response is treated as an
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| 267 | error and would mean the build exits.
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| 268 | <p> Similarly, if <code>failonerror="false"</code> and <code>fork="false"</code>
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| 269 | , then <code><java></code> <b>must</b> return 0 otherwise the build will exit, as the class was run by the build jvm.</p>
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| 270 |
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| 271 | <h3>Examples</h3>
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| 272 | <pre>
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| 273 | <java classname="test.Main">
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| 274 | <arg value="-h"/>
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| 275 | <classpath>
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| 276 | <pathelement location="dist/test.jar"/>
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| 277 | <pathelement path="${java.class.path}"/>
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| 278 | </classpath>
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| 279 | </java>
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| 280 | </pre>
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| 281 | Run a class in this JVM with a new jar on the classpath
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| 282 |
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| 283 | <pre> <java jar="dist/test.jar"
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| 284 | fork="true"
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| 285 | failonerror="true"
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| 286 | maxmemory="128m"
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| 287 | >
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| 288 | <arg value="-h"/>
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| 289 | <classpath>
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| 290 | <pathelement location="dist/test.jar"/>
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| 291 | <pathelement path="${java.class.path}"/>
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| 292 | </classpath>
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| 293 | </java>
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| 294 | </pre>
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| 295 | Run the jar using the manifest supplied entry point, forking (as required),
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| 296 | and with a maximum memory of 128MB. Any non zero return code breaks the build.
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| 297 |
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| 298 | <pre> <java classname="test.Main"/></pre>
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| 299 | <pre> <java classname="test.Main"
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| 300 | fork="yes" >
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| 301 | <sysproperty key="DEBUG" value="true"/>
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| 302 | <arg value="-h"/>
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| 303 | <jvmarg value="-Xrunhprof:cpu=samples,file=log.txt,depth=3"/>
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| 304 | </java>
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| 305 | </pre>
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| 306 | <strong>Note</strong>: you can not specify the (highly deprecated) MSJVM, "jview.exe" as the
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| 307 | JVM, as it takes different parameters for other JVMs,
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| 308 | That JVM can be started from <exec> if required.
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| 309 | <hr>
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| 310 | <p align="center">Copyright © 2000-2004 The Apache Software Foundation. All rights
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| 311 | Reserved.</p>
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| 312 |
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| 313 | </body>
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| 314 | </html>
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| 315 |
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