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POHow to install Java native development headers on OS X Lion
 

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  1. POHow to install Java native development headers on OS X Lion
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    <p>I'm trying to build a JNI project, but I can't seem to find the JNI headers (e.g. <code>jni.h</code>). I've installed "Java for Mac OS X 10.7 Developer Package" from <a href="https://developer.apple.com/downloads/">https://developer.apple.com/downloads/</a>.</p> <p>Various online resources suggest the headers should be in locations such as <code>/System/Library/Frameworks/JavaVM.framework/Headers</code> or <code>/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/include</code>, but I can't find them anywhere -- the installer doesn't seem to be creating them.</p> <p>I see other JDK components -- just for example, <code>/System/Library/Frameworks/JavaVM.framework/Commands/javah</code> -- but not the JNI headers. Any suggestions?</p> <hr> <p>Update: technomage pointed out that Apple now installs the JDK under <code>/Library/Java/JavaVirtualMachines</code>, and the JNI headers were at <code>/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/include/jni.h</code>. </p> <p>But I'm still stuck on my actual goal, which is to build the JNI wrappers for LevelDB (per instructions at github.com/fusesource/leveldbjni). To point Maven at the proper JDK, I added <code>/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/bin</code> to the front of my PATH, and set JAVA_HOME to <code>/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home</code>. After chugging for a while, Maven now fails with:</p> <pre><code>[INFO] --- maven-hawtjni-plugin:1.5:build (default) @ leveldbjni-osx --- [INFO] Extracting /Users/steve/leveldb/leveldbjni/leveldbjni/target/leveldbjni-99-master-SNAPSHOT-native-src.zip to /Users/steve/leveldb/leveldbjni/leveldbjni-osx/target/native-build-extracted [INFO] executing: /bin/sh -c ./configure --disable-ccache --prefix=/Users/steve/leveldb/leveldbjni/leveldbjni-osx/target/native-build/target --with-leveldb=/Users/steve/leveldb/leveldb --with-snappy=/Users/steve/leveldb/snappy-1.0.3 --with-universal --with-leveldb=/Users/steve/leveldb/leveldb --with-snappy=/Users/steve/leveldb/snappy-1.0.3 ... [INFO] configure: JAVA_HOME was set, checking to see if it's a JDK we can use... [INFO] checking if '/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home' is a JDK... no [INFO] configure: javac was on your path, checking to see if it's part of a JDK we can use... [INFO] checking if '/Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home' is a JDK... no [INFO] configure: Taking a guess as to where your OS installs the JDK by default... [INFO] checking if '/System/Library/Frameworks/JavaVM.framework' is a JDK... no [INFO] configure: error: JDK not found. Please use the --with-jni-jdk option </code></pre> <p>I can't tell for sure what Maven is looking at to identify "a JDK we can use"? Some digging around led me to <a href="http://www.arm4.org/trac/browser/branches/architecture/m4/jni.m4">http://www.arm4.org/trac/browser/branches/architecture/m4/jni.m4</a> which appears to look for jni.h in a few places and try to compile it, but I don't know whether this jni.m4 has any actual relationship Maven. I do have jni.h in /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home/include/.</p>
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    1. COjni.m4 is probably related to OpenJDK (upon which the OSX version is based). Check to see if maven has been updated to account for the new OSX JDK path/version, and whether your maven is up-to-date (macports is probably the easiest way to update it).
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    2. COI reinstalled maven from macports... that got me a little farther, but then the build died in a flurry of header files not found. After much further flailing I eventually got it to build. The big remaining problem, I think, was that Apple has moved the SDKs directory. I patched around that by symlinking /Developer/SDKs to /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs. Thanks for all your help!
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    3. COI've heard reports of other developers moving to 1.7 on OSX and having issues with JNI headers being lost, incorrectly symlinked, or just generally messed up. A number of tools depend on the old framework layout (since it was the recommended way by Apple), so expect a bit of an upheaval as everything now has to adjust to the Oracle version.
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