Why is the Java compiler not found in $PATH and also not Java header file jni.h?-CodePudding

The

Note: I didn't delete Firefox because it is required for internal reasons and I don't think it will effect the other variables defined.

UPDATE 2:

When I execute the command which java in MSYS2 window I get the following output:

which: no java in (/usr/local/bin:/usr/bin:/bin:/opt/bin:/c/Windows/System32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0/:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)

I don't understand why it isn't detecting Java.

UPDATE 3:

When I execute the command where java in CMD I get the following:

C:\Program Files (x86)\Common Files\Oracle\Java\javapath\java.exe C:\x\Java\jdk1.8.0_191\bin\java.exe

UPDATE 4:

In MSYS2 I issued the command:

export PATH=$PATH:"C:\x\Java\jdk1.8.0_191\bin"

and this seemed to solve the problem with javac:

checking for javac... javac checking if javac works... yes checking for C:\x\Java\jdk1.8.0_191/include/jni.h... yes

However, I still don't understand why it is not reading the environmental variables correctly.

Additionally, the build still fails due to:

checking for gcj... no checking for guavac... no checking for jikes... no checking for javac... javac checking if javac works... yes checking for C:\x\Java\jdk1.8.0_191/include/jni.h... yes checking for stdlib.h... (cached) yes checking for string.h... (cached) yes checking for size_t... yes checking for uint16_t... yes checking for GNU libc compatible malloc... yes checking for strdup... yes checking for pkg-config... /usr/bin/pkg-config checking pkg-config is at least version 0.9.0... yes checking for LIBPOSTAL... yes checking that generated files are newer than configure... done configure: creating ./config.status config.status: creating Makefile config.status: creating src/main/c/Makefile config.status: creating config.h config.status: config.h is unchanged config.status: executing depfiles commands config.status: executing libtool commands Making install in src/main/c make[1]: Entering directory '/c/x/ProgramFiles/JPostal/src/main/c' /bin/sh ../../../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I../../.. -I/mingw64/include -g -O2 -IC:\x\Java\jdk1.8.0_191/include -MT libjpostal_parser_la-jpostal_AddressParser.lo -MD -MP -MF .deps/libjpostal_parser_la-jpostal_AddressParser.Tpo -c -o libjpostal_parser_la-jpostal_AddressParser.lo `test -f 'jpostal_AddressParser.c' || echo './'`jpostal_AddressParser.c libtool: compile: gcc -DHAVE_CONFIG_H -I. -I../../.. -I/mingw64/include -g -O2 -IC:xJavajdk1.8.0_191/include -MT libjpostal_parser_la-jpostal_AddressParser.lo -MD -MP -MF .deps/libjpostal_parser_la-jpostal_AddressParser.Tpo -c jpostal_AddressParser.c -DDLL_EXPORT -DPIC -o .libs/libjpostal_parser_la-jpostal_AddressParser.o jpostal_AddressParser.c:1:10: fatal error: jni.h: No such file or directory 1 | #include <jni.h> | ^~~~~~~ compilation terminated. make[1]: *** [Makefile:473: libjpostal_parser_la-jpostal_AddressParser.lo] Error 1 make[1]: Leaving directory '/c/x/ProgramFiles/JPostal/src/main/c' make: *** [Makefile:404: install-recursive] Error 1

UPDATE 5:

See screenshot below showing the directory Java is installed in:

$Contents of directory C:\x\Java\jdk1.8.0_191$

UPDATE 6:

The screenshot below shows jni.h file present in Java installation folder:

$Contents of directory C:\x\Java\jdk1.8.0_191\include$

CodePudding user response：

I'd look closely at how your build process functions. Your question says you are issuing a 'gradlew' command, so first thing to check is "gradlew --version". If you get the expected version of both Gradle and Java from that, then all is well with your OS environment. Since your question also mentions "Make", my belief is that gradle is invoking Make. If that's the case, then see what environment is being provided (by Gradle) when Make is spun-up. Best guess is that the environment that 'Make' is using is somehow different than the one the OS has. e.g. it has a different (or non-existant) $PATH or $JAVA_HOME. Easy to check... in the 'Makefile', have it output things like 'env' or $PATH or $JAVA_HOME - verify they are what you expect.

CodePudding user response：

The answer to this question might help you. There are ways in gradle to configure the java compiler.