blocks|key|1539744|text|根据ant+manual，设置JAVA_HOME应该有效-您确定更改后的设置对ant可见吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1539745|或者，您可以使用JAVACMD变量。|1539746|entityMap|0|LINK|mutability|MUTABLE|url|http://ant.apache.org/manual/running.html#envvars^0|2|A|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

According to the <a href="http://ant.apache.org/manual/running.html#envvars" rel="noreferrer">ant manual</a>, setting JAVA_HOME should work - are you sure the changed setting is visible to ant?

Alternatively, you could use the JAVACMD variable.

blocks|key|1324612|text|在冗余模式下运行ant：ant+-v并查找线索。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1324613|entityMap^0|C|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Run ant in verbose mode : <code>ant -v</code> and looks for clues.

blocks|key|1539800|text|您还可以在javac任务中指定要使用的兼容性级别(+1.4、1.5、1.6+)，可以设置“源”和“目标”级别的值，请在此处查看文档：Javac+task+documentation|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1539801|entityMap|0|LINK|mutability|MUTABLE|url|http://ant.apache.org/manual/Tasks/javac.html^0|1U|O|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can also specify in a javac task what level of compatibility ( 1.4, 1.5, 1.6 ) you want to use, you can set the "source" and "target" level values, check the docs here :
<a href="http://ant.apache.org/manual/Tasks/javac.html" rel="noreferrer">Javac task documentation</a>

blocks|key|1324678|text|您可以使用javac标记上的target和source属性来设置目标运行时。下面的示例将在任何支持1.4版或更高版本的编译器上将任何源代码编译为目标1.4版。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1324679|<javac+compiler="classic"+taskname="javac"+includeAntRuntime="no"+fork="+deprecation="true"+target="1.4"+source="1.4"+srcdir="${src}"+destdir="${classes}">|code-block|syntax|javascript|1324680|注意：'srcdir‘和'destdir’是在构建脚本中的其他位置设置的属性值，例如<property+name="classes"+value="c:/classes"+/>|offset|length|style|CODE|1324681|entityMap^0|0|0|16|1A|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can use the target and source properties on the javac tag to set a target runtime. The example below will compile any source code to target version 1.4 on any compiler that supports version 1.4 or later.

<pre><code>&lt;javac compiler="classic" taskname="javac" includeAntRuntime="no" fork=" deprecation="true" target="1.4" source="1.4" srcdir="${src}" destdir="${classes}"&gt;
</code></pre>

Note: The 'srcdir' and 'destdir' are property values set else where in the build script,
e.g. <code>&lt;property name="classes" value="c:/classes" /&gt;</code>

blocks|key|1324750|text|刚刚出现这个问题，是因为我第一次将构建文件添加到ant-view时，默认的JRE是1.6。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1324751|没有特定于项目的JRE，我将缺省值改为1.5，甚至eclipse也是在1.5中运行，JAVA_HOME也是1.5。从命令行运行ant目标使用的是JRE1.5，但在eclipse中它仍然使用1.6。|1324752|我不得不右键单击ant目标，选择Run+As...并在JRE选项卡下更改JRE。在后续运行时会记住此设置。|1324753|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Just had this issue, it happened because I'd first added the build file to the ant-view when the default JRE was 1.6. 

There was no project-specific JRE and I changed the default to 1.5, even eclipse was running in 1.5, and JAVA_HOME was 1.5 too. Running the ant target from the command line used JRE 1.5, but within eclipse it still used 1.6.

I had to right-click the ant target, select Run As... and change the JRE under the JRE tab. This setting is remembered for subsequent runs.

blocks|key|1539945|text|如果从eclipse运行Ant，eclipse将使用类路径(构建路径)中配置的jdk或jre。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1539946|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you run Ant from eclipse, the eclipse will use jdk or jre that is configured in the class-path(build path).

blocks|key|1540023|text|这是一个相当老的问题，但我将添加我的笔记以供将来参考。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1540024|我遇到了类似的问题，并通过更改PATH变量中导出的顺序来修复它。|1540025|例如，我使用了一种将字符串连接到路径的方法(这只是一个示例)：|1540026|$>+export+PATH='$PATH:'$JAVA_HOME|code-block|syntax|javascript|1540027|如果我的变量PATH中已经有一个java，那么最后一个值就没有意义了，因此顺序很重要。为了解决这个问题，我开始反转它，首先添加我的变量，然后添加路径。|1540028|根据这个想法，我颠倒了导出ANT_HOME的顺序。在ANT_HOME之前添加JAVA_HOME。|1540029|这可能只是一个巧合，但它对我来说很有效。|1540030|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

This is rather an old question, but I will add my notes for future references.

I had a similar issue and fixed it by changing the order of the exports in the PATH variable.

For example I was using a method of concatenating strings to my PATH by doing (this is just an example):

<pre><code>$&gt; export PATH='$PATH:'$JAVA_HOME
</code></pre>

If my variable PATH already had a java in it, the last value would be meaningless, thus the order would matter. To solve this I started inverting it by adding my variable first, then adding the PATH.

Following this idea I inverted the order that ANT_HOME was being exported. Adding JAVA_HOME before ANT_HOME.

This could be just a coincidence, but it worked for me.

blocks|key|1324956|text|如果你没有使用eclipse的话。然后，您可以直接在文件上更改ant+java属性，如此处所述。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1324957|http://pissedoff-techie.blogspot.in/2014/09/ant-picks-up-incorrect-java-version.html|offset|length|1324958|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

If you are not using eclipse. Then you can change the ant java property directly on the file as mentioned here.

<a href="http://pissedoff-techie.blogspot.in/2014/09/ant-picks-up-incorrect-java-version.html" rel="nofollow">http://pissedoff-techie.blogspot.in/2014/09/ant-picks-up-incorrect-java-version.html</a>

blocks|key|1325014|text|对javac标记使用以下两个属性：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1325015|fork="yes"++
executable="full-path-to-the-javac-you-want-to-use".|code-block|syntax|javascript|1325016|有关这些属性的说明，请参阅here|1325017|entityMap|0|LINK|mutability|MUTABLE|url|http://ant.apache.org/manual/Tasks/javac.html^0|1|5|0|0|D|4|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|M|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

Use the following 2 properties for <code>javac</code> tag: 

<pre><code>fork="yes" 
executable="full-path-to-the-javac-you-want-to-use".
</code></pre>

Explaination of the properties can be found <a href="http://ant.apache.org/manual/Tasks/javac.html" rel="nofollow">here</a>

blocks|key|1325061|text|构建文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1325062|<target+name="print-version">+
+++<echo>Java/JVM+version:+${ant.java.version}</echo>+
+++<echo>Java/JVM+detail+version:+${java.version}</echo>+
</target>|code-block|syntax|javascript|1325063|输出：|1325064|[echo]+Java/JVM+version:+1.5
[echo]+Java/JVM+detail+version:+1.5.0_08|1325065|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Build file:

<pre><code>&lt;target name="print-version"&gt; 
 &lt;echo&gt;Java/JVM version: ${ant.java.version}&lt;/echo&gt; 
 &lt;echo&gt;Java/JVM detail version: ${java.version}&lt;/echo&gt; 
&lt;/target&gt;
</code></pre>

Output:

<pre><code>[echo] Java/JVM version: 1.5
[echo] Java/JVM detail version: 1.5.0_08
</code></pre>

blocks|key|1540289|text|According+to+the+Ant+Documentation，将JAVACMD环境变量设置为您希望在其下运行Ant版本的java.exe的完整路径。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1540290|entityMap|0|LINK|mutability|MUTABLE|url|http://ant.apache.org/manual/running.html#envvars^0|10|7|1S|8|0|Y|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@$9|S|A|T|1|U]]|E|$]]|$1|F|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

<a href="http://ant.apache.org/manual/running.html#envvars" rel="nofollow noreferrer">According to the Ant Documentation</a>, set <code>JAVACMD</code> environment variable to complete path to <code>java.exe</code> of the JRE version that you want to run Ant under.

blocks|key|1540362|text|将JAVA_HOME环境变量设置为所需的java版本(在本例中为Java1.5)，然后在build.xml中在<javac></javac>标记内使用executable="${JAVA_HOME}/bin/javac"。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1540363|示例：|1540364|<target+name="java+compiler"+description="Compiles+the+java+code">
++++<javac+executable="${JAVA_HOME}/bin/javac"+srcdir="./src"+
++++++++destdir="${build.dir}/classes">+
++++</javac>+
</target>|code-block|syntax|javascript|1540365|entityMap^0|1|9|18|9|1J|F|23|Z|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

Set your <code>JAVA_HOME</code> environment variable with the required java version (in your case java 1.5), then in <code>build.xml</code> use <code>executable="${JAVA_HOME}/bin/javac"</code> inside <code>&lt;javac&gt;&lt;/javac&gt;</code> tag .

example:

<pre><code>&lt;target name="java compiler" description="Compiles the java code"&gt;
 &lt;javac executable="${JAVA_HOME}/bin/javac" srcdir="./src" 
 destdir="${build.dir}/classes"&gt; 
 &lt;/javac&gt; 
&lt;/target&gt;
</code></pre>

I'm using Ant 1.7.0 and installed java 1.6 which is in JAVA_HOME.

I want to build a project using java 1.5, so I've exported JAVA_HOME to be my java 1.5 directory. 

<pre><code>java -version
</code></pre>

says "1.5". When I run Ant it uses java 1.6.

Ant is using wrong java version

编译器

Java

我使用的是Ant1.7.0，安装的是JAVA_HOME版本的Java1.6。我想使用java1.5构建一个项目，所以我将JAVA_HOME导出到我的java1.5目录中。java -version上面写着"1.5“当我运行Ant时，它使用的是java1.6。

问Ant正在使用错误的java版本
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