Avoid install java related targets if java sdk is not enabled.

Signed-off-by: Tao He <linzhu.ht@alibaba-inc.com>

analytical_engine/CMakeLists.txt

@@ -65,6 +65,10 @@ include(CheckCXXCompilerFlag)
 include(CheckLibraryExists)
 include(CheckCXXSourceRuns)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# include /usr/local/lib as cmake installed dependencies will be placed there by default
+include_directories(SYSTEM /usr/local/include)
+
 include_directories(${PROJECT_SOURCE_DIR})
 include_directories(${PROJECT_SOURCE_DIR}/proto)
 
@@ -375,20 +379,22 @@ add_custom_target(gsa_clformat
     VERBATIM)
 
 # Install GAE Java SDK
-set(GAE_JAVA_DIR "${CMAKE_CURRENT_SOURCE_DIR}/java/")
-set(GAE_JAVA_RUNTIME_DIR "${GAE_JAVA_DIR}/grape-runtime/")
-set(GAE_JAVA_RUNTIME_JAR "${GAE_JAVA_RUNTIME_DIR}/target/grape-runtime-${GRAPHSCOPE_ANALYTICAL_VERSION}-shaded.jar") 
-add_custom_command(
-    TARGET gs_proto
-    COMMAND mvn clean install -DskipTests --quiet
-    WORKING_DIRECTORY ${GAE_JAVA_DIR}
-    COMMENT "Building GAE-java..."
-    VERBATIM
-)
-install(FILES DESTINATION lib)
-install(FILES "${GAE_JAVA_RUNTIME_DIR}/target/native/libgrape-jni.so" DESTINATION lib)
-install(FILES "${GAE_JAVA_RUNTIME_JAR}" DESTINATION lib)
-install(FILES "${GAE_JAVA_DIR}/grape_jvm_opts" DESTINATION conf)
+if(ENABLE_JAVA_SDK)
+    set(GAE_JAVA_DIR "${CMAKE_CURRENT_SOURCE_DIR}/java/")
+    set(GAE_JAVA_RUNTIME_DIR "${GAE_JAVA_DIR}/grape-runtime/")
+    set(GAE_JAVA_RUNTIME_JAR "${GAE_JAVA_RUNTIME_DIR}/target/grape-runtime-${GRAPHSCOPE_ANALYTICAL_VERSION}-shaded.jar")
+    add_custom_command(
+        COMMAND mvn clean install -DskipTests --quiet
+        DEPENDS gs_proto
+        WORKING_DIRECTORY ${GAE_JAVA_DIR}
+        COMMENT "Building GAE-java..."
+        VERBATIM
+    )
+    install(FILES DESTINATION lib)
+    install(FILES "${GAE_JAVA_RUNTIME_DIR}/target/native/libgrape-jni.so" DESTINATION lib)
+    install(FILES "${GAE_JAVA_RUNTIME_JAR}" DESTINATION lib)
+    install(FILES "${GAE_JAVA_DIR}/grape_jvm_opts" DESTINATION conf)
+endif()
 
 # Install binaries
 macro(install_gsa_binary target)