[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.

wpilibj/CMakeLists.txt

@@ -1,78 +0,0 @@
-project(wpilibj)
-
-# Java bindings
-if(WITH_JAVA)
-    include(UseJava)
-
-    set(OPENCV_JAVA_INSTALL_DIR ${OpenCV_INSTALL_PATH}/share/java/opencv4)
-
-    find_file(
-        OPENCV_JAR_FILE
-        NAMES opencv-${OpenCV_VERSION_MAJOR}${OpenCV_VERSION_MINOR}${OpenCV_VERSION_PATCH}.jar
-        PATHS
-            ${OPENCV_JAVA_INSTALL_DIR}
-            ${OpenCV_INSTALL_PATH}/bin
-            ${OpenCV_INSTALL_PATH}/share/java
-            ${OpenCV_INSTALL_PATH}/share/OpenCV/java
-        NO_DEFAULT_PATH
-    )
-
-    configure_file(
-        src/generate/WPILibVersion.java.in
-        generated/main/java/org/wpilib/system/WPILibVersion.java
-    )
-
-    file(GLOB_RECURSE JAVA_SOURCES src/main/java/*.java src/generated/main/java/*.java)
-    file(GLOB EJML_JARS "${WPILIB_BINARY_DIR}/wpimath/thirdparty/ejml/*.jar")
-    file(GLOB AVAJE_JARS "${WPILIB_BINARY_DIR}/wpiutil/thirdparty/avaje/*.jar")
-
-    add_jar(
-        wpilibj_jar
-        ${JAVA_SOURCES}
-        ${CMAKE_CURRENT_BINARY_DIR}/generated/main/java/org/wpilib/system/WPILibVersion.java
-        INCLUDE_JARS
-            hal_jar
-            ntcore_jar
-            ${EJML_JARS}
-            ${AVAJE_JARS}
-            ${OPENCV_JAR_FILE}
-            cscore_jar
-            cameraserver_jar
-            wpimath_jar
-            wpiunits_jar
-            wpiutil_jar
-            datalog_jar
-        OUTPUT_NAME wpilibj
-        OUTPUT_DIR ${WPILIB_BINARY_DIR}/${java_lib_dest}
-    )
-    set_property(TARGET wpilibj_jar PROPERTY FOLDER "java")
-
-    install_jar(wpilibj_jar DESTINATION ${java_lib_dest})
-    install_jar_exports(TARGETS wpilibj_jar FILE wpilibj.cmake DESTINATION share/wpilibj)
-
-    install(FILES wpilibj-config.cmake DESTINATION share/wpilibj)
-endif()
-
-if(WITH_JAVA_SOURCE)
-    include(UseJava)
-    include(CreateSourceJar)
-    # Generate version file if it wasn't generated already
-    if(NOT WITH_JAVA)
-        configure_file(
-            src/generate/WPILibVersion.java.in
-            generated/main/java/org/wpilib/system/WPILibVersion.java
-        )
-    endif()
-    add_source_jar(
-        wpilibj_src_jar
-        BASE_DIRECTORIES
-            ${CMAKE_CURRENT_SOURCE_DIR}/src/main/java
-            ${CMAKE_CURRENT_SOURCE_DIR}/src/generated/main/java
-            ${CMAKE_CURRENT_BINARY_DIR}/generated/main/java
-        OUTPUT_NAME wpilibj-sources
-        OUTPUT_DIR ${WPILIB_BINARY_DIR}/${java_lib_dest}
-    )
-    set_property(TARGET wpilibj_src_jar PROPERTY FOLDER "java")
-
-    install_jar(wpilibj_src_jar DESTINATION ${java_lib_dest})
-endif()

wpilibj/wpilibj-config.cmake

@@ -1,2 +0,0 @@
-get_filename_component(SELF_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
-include(${SELF_DIR}/wpilibj.cmake)