![\"ant_opts-in-ant-script\"](\"http:\/\/www.scmgalaxy.com\/tutorials\/wp-content\/uploads\/2010\/04\/ant_opts-in-ant-script.png\")
<\/p>\n<\/p>\n
Usage of ANT_OPTS in Ant Script | ANT_OPTS capabilities<\/b><\/p>\n
Ant has three environment variables that you can use to set its default behavior.
\n\u2022 ANT_ARGS Set this variable to include those options you use frequently.
\n\u2022 ANT_OPTS is a list of arguments that you want to pass to the JVM that will run Ant.
\n\u2022 JAVACMD is the absolute path to the Java executable you want Ant to use. you may specify a value for the JAVACMD environment variable. This defaults to %JAVA_HOME%\\bin\\java, typically invoking the JVM provided in Sun’s Java Development Kit. Ant provides JAVACMD for those who wish to specify an alternate JVM. full path of the Java executable. Use this to invoke a different JVM than JAVA_HOME\/bin\/java(.exe).<\/p>\n
These are useful environment variables that the Ant wrapper scripts use when
\ninvoking Ant: ANT_OPTS and ANT_ARGS. Neither of these is typically set by users,
\nbut each can provide value for certain situations.<\/p>\n
The ANT_OPTS environment variable provides options to the JVM executing Ant,
\nsuch as system properties and memory configuration. ANT_OPTS – command-line arguments that should be passed to the JVM. For example, you can define system properties or set the maximum Java heap size here.<\/p>\n
For authenticated proxy: <\/b>
\nSet your ANT_OPTS environment variable to configure your proxy if you have one. For instance:
\nset ANT_OPTS=-Dhttp.proxyHost=myproxy -Dhttp.proxyPort=3128<\/p>\n
You can set these properties by either modifying Ant’s startup script, or by
\nusing the ANT_OPTS environment variable. The following example shows the Windows commands to specify these properties using ANT_OPTS, and then to invoke Ant:
\nset ANT_OPTS=-DproxySet=true -DproxyHost=localhost -DproxyPort=80
\nant mytarget
\nThe same trick works on Unix, although the syntax is slightly different depending on which
\nshell you use:
\n$ export ANT_OPTS=”-DproxySet=true -DproxyHost=localhost -DproxyPort=80″
\n$ ant mytarget<\/p>\n
set ANT_OPTS=-Dhttp.proxyHost=myproxyhost -Dhttp.proxyPort=8080 -Dhttp.proxyUserName=myproxyusername -Dhttp.proxyPassword=myproxypassword -Dhttps.proxyHost=myproxyhost -Dhttps.proxyPort=8080<\/p>\n
<\/p>\n
Use <\/b>ANT_OPTS <\/b>to control Ant\u2019s virtual machine settings.<\/b>
\nSome tasks may require more memory, which you can set in the ANT_OPTS environment variable, using the appropriate mechanism for your platform:
\nset ANT_OPTS=-Xmx500M
\nexport ANT_OPTS=-Xmx500M<\/p>\n
Setting the maximum heap size is another common use of ANT_OPTS. Here is how we set the maximum size to 128 MB when using Sun’s JDK:
\nset ANT_OPTS=-Xmx128m<\/p>\n
One environment variable you may wish to set is ANT_OPTS. The value of this variable is passed as a JVM argument. Specifying system properties is a common use. In this simple
\nexample, we pass the <\/b>log.dir <\/b>system property to the JVM running Ant:<\/b>
\n$ set ANT_OPTS=-Dlog.dir=C:\\logs
\n$ ant run
\nNow this property is available within the buildfile, for instance:
\n<echo>Log directory is set to: ${log.dir}<\/echo>
\nIf the buildfile runs a Java application, the property may be retrieved from within it as
\nfollows:
\nString logDir = System.getProperty(“log.dir”);<\/p>\n
<\/p>\n
Troubleshoot: Illegal Java options in the ANT_OPTS variable<\/b>
\nThe environment variable ANT_OPTS provides a means to pass options into Ant,
\nsuch as a permanent definition of some properties, or the memory parameters for
\nJava. The variable must contain only options the local JVM recognizes. Any invalid
\nparameter will generate an error message such as the following (where ANT_OPTS was
\nset to \u20133):
\nUnrecognized option: -3
\nCould not create the Java virtual machine.<\/p>\n
If the variable contains a string that is mistaken for the name of the Java class to run
\nas the main class, then a different error appears:<\/p>\n
Exception in thread “main” java.lang.NoClassDefFoundError: error-string
\nTest: Examine ANT_OPTS and verify that the variable is unset or contains valid
\nJVM options.
\nFix: Correct or clear the variable.<\/p>\n","protected":false},"excerpt":{"rendered":"
Usage of ANT_OPTS in Ant Script | ANT_OPTS capabilities Ant has three environment variables that you can use to set its default behavior. \u2022 ANT_ARGS Set this variable to include those options you use frequently. \u2022 ANT_OPTS is a list of arguments that you want to pass to the JVM that will run Ant. \u2022…<\/p>\n","protected":false},"author":1,"featured_media":4239,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_joinchat":[],"footnotes":""},"categories":[12],"tags":[209,3795,3799,3801,3797,3798,3045,683,3796,3800,1122,3802,1806,938,213,3794],"class_list":["post-229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-apache-ant","tag-ant","tag-ant-opts","tag-ant-opts-capabilities","tag-ant-opts-in-ant-script","tag-ant-opts-usage","tag-ant-opts-usage-in-ant-script","tag-ant-script","tag-apache-ant","tag-capabilities","tag-capabilities-of-ant-opts","tag-guide","tag-how-to-use-ant-opts-in-ant-script","tag-instruction","tag-reference","tag-tutorial","tag-usage"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=229"}],"version-history":[{"count":2,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/229\/revisions"}],"predecessor-version":[{"id":4241,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/229\/revisions\/4241"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media\/4239"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}