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[Java] Note use of %ignore with %native

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This is needed if you're wanting to effectively replace the generated
JNI wrapper for a C/C++ function.

Fixes https://sourceforge.net/p/swig/bugs/368/
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Olly Betts 2022-02-01 16:38:16 +13:00
commit eb13261950
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Doc/Manual/Java.html
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@ -9062,6 +9062,11 @@ You may have to add in some "jtype", "jstype", "javain" and "javaout" typemaps w
Here the default typemaps work for <tt>int</tt> and <tt>char *</tt>.
</p>
<p>
Note that if you're wanting to effectively <b>replace</b> the JNI code generated for a C/C++ function then you'll need to use <tt>%ignore</tt> as well
to tell SWIG not to automatically generate a JNI wrapper for it.
</p>
<p>
In summary the <tt>%native</tt> directive is telling SWIG to generate the Java code to access the JNI C code, but not the JNI C function itself.
This directive is only really useful if you want to mix your own hand crafted JNI code and the SWIG generated code into one Java class or package.