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IDProjectCategoryView StatusDate SubmittedLast Update
0014143CMakeModulespublic2013-05-15 16:182013-10-07 10:10
Reportervitaut 
Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionno change required 
Platformx64OSWindowsOS VersionXP Pro x64 SP2
Product VersionCMake 2.8.10.2 
Target VersionFixed in Version 
Summary0014143: FindJNI cannot find JDK installed
DescriptionFindJNI cannot find JDK installed in C:\Program Files\Java\jdk1.7.0_21 on Windows XP Professional x64 Edition with SP2.

It seems that the problem is find_library not resolving registry references in PATHS which is illustrated by the following CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project(TEST)

get_filename_component(java_install_version
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit;CurrentVersion]" NAME)
message("java_install_version: ${java_install_version}")

find_library(JAVA_AWT_LIBRARY jawt
  PATHS "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\${java_install_version};JavaHome]/lib")
message("JAVA_AWT_LIBRARY: ${JAVA_AWT_LIBRARY}")

get_filename_component(java_library_path
  "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\${java_install_version};JavaHome]/lib" ABSOLUTE)
message("java_library_path: ${java_library_path}")
find_library(JAVA_AWT_LIBRARY2 jawt
  PATHS "${java_library_path}")
message("JAVA_AWT_LIBRARY2: ${JAVA_AWT_LIBRARY2}")

CMake gives the following output on it:

java_install_version: 1.7
JAVA_AWT_LIBRARY: JAVA_AWT_LIBRARY-NOTFOUND
java_library_path: C:/Program Files/Java/jdk1.7.0_21/lib
JAVA_AWT_LIBRARY2: C:/Program Files/Java/jdk1.7.0_21/lib/jawt.lib
-- Configuring done
-- Generating done
-- Build files have been written to: C:/temp/test

Note that JAVA_AWT_LIBRARY is not found, while the JAVA_AWT_LIBRARY2 where PATHS don't contain registry references is found. The find_library code for JAVA_AWT_LIBRARY is similar to what FindJNI.cmake uses.
Steps To Reproduce1. Install JDK.
2. Run CMake using the following CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project(TEST)
find_package(JNI)

3. Observe that CMake reports
-- Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
TagsNo tags attached.
Attached Files

 Relationships
related to 0011303closed CMake fails to detect Python X64 on Win64 

  Notes
(0033046)
Brad King (manager)
2013-05-15 16:24

 When you configure the CMake project do you build with a toolchain of the same architecture as the installed JDK?

The get_filename_component command tries both 32-bit and 64-bit views of the registry:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmGetFilenameComponentCommand.cxx;hb=v2.8.10.2#l38 [^]

The find_library command tries only the view matching the target architecture of the build:

 http://cmake.org/gitweb?p=cmake.git;a=blob;f=Source/cmFindCommon.cxx;hb=v2.8.10.2#l381 [^]
(0033047)
vitaut (reporter)
2013-05-15 17:14

 I run CMake in Visual Studio x64 Win64 Command Prompt with cl reporting "Microsoft (R) C/C++ Optimizing Compiler Version 16.00.30319.01 for x64" and I have 64-bit JDK installed so I think the answer is yes.
(0033060)
Brad King (manager)
2013-05-16 11:51

 What generator are you using? The VS IDE generators do not care about the environment from which you run CMake, only the Makefile and Ninja generators do.
(0033081)
vitaut (reporter)
2013-05-17 00:22

 I am using the default generator which is "Visual Studio 10". Tried "Visual Studio 10 Win64", but with the same result (JNI not found).
(0033082)
Brad King (manager)
2013-05-17 08:09

 On Win7 64-bit with CMake 2.8.11 I ran the example from the description with the "Visual Studio 10 Win64" generator and got:

java_install_version: 1.7
JAVA_AWT_LIBRARY: C:/Program Files/Java/jdk1.7.0_21/lib/jawt.lib
java_library_path: C:/Program Files/Java/jdk1.7.0_21/lib
JAVA_AWT_LIBRARY2: C:/Program Files/Java/jdk1.7.0_21/lib/jawt.lib

Then I switched to the "Steps to Reproduce" example and got:

-- Found JNI: C:/Program Files/Java/jdk1.7.0_21/lib/jawt.lib
(0033088)
vitaut (reporter)
2013-05-17 10:01

 Strange. Here's what I get:

C:\temp\test>cmake -G "Visual Studio 10 Win64"
java_install_version: 1.7
JAVA_AWT_LIBRARY: JAVA_AWT_LIBRARY-NOTFOUND
java_library_path: C:/Program Files/Java/jdk1.7.0_21/lib
JAVA_AWT_LIBRARY2: C:/Program Files/Java/jdk1.7.0_21/lib/jawt.lib
-- Configuring done
-- Generating done
-- Build files have been written to: C:/temp/test
(0033089)
vitaut (reporter)
2013-05-17 10:25

 I've tried deleting all the generated files and not only CMakeCache.txt, and then re-running cmake -G "Visual Studio 10 Win64" and JNI is found now.

Here's what I did before
1. cmake .
JNI not found.
2. del CMakeCache.txt
3. cmake -G "Visual Studio 10 Win64"
JNI not found.

So it seems CMake re-uses some information other than CMakeCache.txt between configurations which prevents finding JNI. I'm not sure if it is something expected or not.

Thanks
(0033090)
Brad King (manager)
2013-05-17 10:36

 This is expected. You need to use a fresh build tree to change generators.
(0033091)
Brad King (manager)
2013-05-17 10:38

 Actually you may have hit issue 0013756 with CMake 2.8.10.2 when trying to change generators, and that was fixed here:

 http://cmake.org/gitweb?p=cmake.git;a=commitdiff;h=1df09e57 [^]
(0034070)
Robert Maynard (manager)
2013-10-07 10:10

 Closing resolved issues that have not been updated in more than 4 months.

 Issue History
Date Modified Username Field Change
2013-05-15 16:18 vitaut New Issue
2013-05-15 16:24 Brad King Note Added: 0033046
2013-05-15 17:14 vitaut Note Added: 0033047
2013-05-16 11:51 Brad King Note Added: 0033060
2013-05-17 00:22 vitaut Note Added: 0033081
2013-05-17 08:09 Brad King Note Added: 0033082
2013-05-17 10:01 vitaut Note Added: 0033088
2013-05-17 10:25 vitaut Note Added: 0033089
2013-05-17 10:36 Brad King Note Added: 0033090
2013-05-17 10:36 Brad King Status new => resolved
2013-05-17 10:36 Brad King Resolution open => no change required
2013-05-17 10:38 Brad King Note Added: 0033091
2013-05-31 12:44 Brad King Relationship added related to 0011303
2013-10-07 10:10 Robert Maynard Note Added: 0034070
2013-10-07 10:10 Robert Maynard Status resolved => closed

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