[build] Remove cmake Java support (#8952)

This is increasingly difficult to maintain, and has very limited
benefit. Modern coprocessors with enough horsepower to run Java
applications can use the Gradle or Bazel build systems instead.

apriltag/CMakeLists.txt

@@ -31,81 +31,6 @@ else()
     )
 endif()
 
-file(GLOB apriltag_jni_src src/main/native/cpp/jni/AprilTagJNI.cpp)
-
-if(WITH_JAVA)
-    include(UseJava)
-
-    set(CMAKE_JNI_TARGET true)
-
-    file(GLOB EJML_JARS "${WPILIB_BINARY_DIR}/wpimath/thirdparty/ejml/*.jar")
-    file(GLOB AVAJE_JARS "${WPILIB_BINARY_DIR}/wpiutil/thirdparty/avaje/*.jar")
-    find_file(
-        OPENCV_JAR_FILE
-        NAMES opencv-${OpenCV_VERSION_MAJOR}${OpenCV_VERSION_MINOR}${OpenCV_VERSION_PATCH}.jar
-        PATHS
-            ${OPENCV_JAVA_INSTALL_DIR}
-            ${OpenCV_INSTALL_PATH}/bin
-            ${OpenCV_INSTALL_PATH}/share/java
-            ${OpenCV_INSTALL_PATH}/share/java/opencv4
-            ${OpenCV_INSTALL_PATH}/share/OpenCV/java
-        NO_DEFAULT_PATH
-    )
-
-    file(GLOB_RECURSE JAVA_SOURCES src/main/java/*.java)
-    file(
-        GLOB_RECURSE JAVA_RESOURCES
-        RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
-        src/main/native/resources/*.json
-    )
-    add_jar(
-        apriltag_jar
-        SOURCES ${JAVA_SOURCES}
-        RESOURCES
-        NAMESPACE "org/wpilib/vision/apriltag" ${JAVA_RESOURCES}
-        INCLUDE_JARS
-            wpimath_jar
-            wpiunits_jar
-            wpiutil_jar
-            ${EJML_JARS}
-            ${OPENCV_JAR_FILE}
-            ${AVAJE_JARS}
-        OUTPUT_NAME apriltag
-        OUTPUT_DIR ${WPILIB_BINARY_DIR}/${java_lib_dest}
-        GENERATE_NATIVE_HEADERS apriltag_jni_headers
-    )
-    set_property(TARGET apriltag_jar PROPERTY FOLDER "java")
-
-    install_jar(apriltag_jar DESTINATION ${java_lib_dest})
-    install_jar_exports(TARGETS apriltag_jar FILE apriltag_jar.cmake DESTINATION share/apriltag)
-
-    add_library(apriltagjni ${apriltag_jni_src} ${apriltaglib_src})
-    wpilib_target_warnings(apriltagjni)
-    target_link_libraries(apriltagjni PUBLIC apriltag)
-
-    set_property(TARGET apriltagjni PROPERTY FOLDER "libraries")
-
-    target_link_libraries(apriltagjni PRIVATE apriltag_jni_headers)
-    add_dependencies(apriltagjni apriltag_jar)
-
-    install(TARGETS apriltagjni EXPORT apriltagjni)
-    export(TARGETS apriltagjni FILE apriltagjni.cmake NAMESPACE apriltagjni::)
-endif()
-
-if(WITH_JAVA_SOURCE)
-    include(UseJava)
-    include(CreateSourceJar)
-    add_source_jar(
-        apriltag_src_jar
-        BASE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/src/main/java
-        OUTPUT_NAME apriltag-sources
-        OUTPUT_DIR ${WPILIB_BINARY_DIR}/${java_lib_dest}
-    )
-    set_property(TARGET apriltag_src_jar PROPERTY FOLDER "java")
-
-    install_jar(apriltag_src_jar DESTINATION ${java_lib_dest})
-endif()
-
 generate_resources(
     src/main/native/resources/org/wpilib/vision/apriltag
     generated/main/cpp

apriltag/apriltag-config.cmake.in

@@ -5,6 +5,3 @@ include(CMakeFindDependencyMacro)
 
 @FILENAME_DEP_REPLACE@
 include(${SELF_DIR}/apriltag.cmake)
-if(@WITH_JAVA@)
-    include(${SELF_DIR}/apriltag_jar.cmake)
-endif()