Ant build - specifying target Java version

Dear All,

I am trying to modify build.xml config to produce bytecode compatible with
JDK 1.7.

So far I tried:

(1) compile on JDK 8 with modifying all <javac> tasks to <javac target="1.7"
...>
(2) compile on JDK 8 with global param <property
name="ant.build.javac.target" value="1.7" />
(3) same as above with older Ant version to avoid possible issue:
https://bz.apache.org/bugzilla/show_bug.cgi?id=59683
(4) compile on JDK 7u80

Nothing helped. Especially the last item is very suspicious. Both JAVA_HOME
and PATH variable points to JDK7, but when testign the produced jars, I am
getting the same error message:

"jdk1.7.0_80\bin\java" -Xmx2G -jar batik-rasterizer-svn-trunk.jar -m
image/png -w 200 -h 200 horologium.svg
Exception in thread "main" java.lang.UnsupportedClassVersionError:
org/apache/batik/apps/rasterizer/Main : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at
sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

Is it possible Ant could somehow bypass my JDK settings and use another JDK
version?

I am stuck now. Windows 10 64-bit + Oracle JDK 7/8.

Thanks,

Jan