[Bug 65381] java task without fork=yes shows "WARNING: java.lang.System::setSecurityManager is deprecated and will be removed in a future release...." with jd17ea26

[bugzilla]

https://bz.apache.org/bugzilla/show_bug.cgi?id=65381

--- Comment #7 from Arjan Tijms <arjan.ti...@gmail.com> ---
> note that JDK 17 only deprecates the SecurityManager for future removal and 
> except for the WARNING message in the STDERR nothing else changes in JDK 17, 
> functionality wise

In JDK 18 this is no longer the case. Instead of an error message, an exception
is thrown, e.g:

java.lang.UnsupportedOperationException: The Security Manager is deprecated and
will be removed in a future release
     [java]     at
java.base/java.lang.System.setSecurityManager(System.java:411)
     [java]     at
org.apache.tools.ant.types.Permissions.setSecurityManager(Permissions.java:103)
     [java]     at
org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:216)
     [java]     at
org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:155)

This breaks the builds, obviously.

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