Add JAVAC_ARGS as Makefile variable

Summary:
Set to "-Xlint:deprecation -Xlint:unchecked" for non-zero
DEBUG_LEVEL

Shows up a few warnings for later perusal however passes ok.
Closes https://github.com/facebook/rocksdb/pull/2557

Differential Revision: D5408104

Pulled By: sagar0

fbshipit-source-id: 02908602e09b46d33b0dfc0ffd4b11954db03c53

java/CMakeLists.txt

@@ -196,7 +196,7 @@ else()
   set(JAVAH javah)
 endif()
 
-execute_process(COMMAND ${JAVAC} -cp ${JAVA_TESTCLASSPATH} -d ${PROJECT_SOURCE_DIR}/java/classes ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/util/*.java ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/*.java ${PROJECT_SOURCE_DIR}/java/src/test/java/org/rocksdb/*.java)
+execute_process(COMMAND ${JAVAC} ${JAVAC_ARGS} -cp ${JAVA_TESTCLASSPATH} -d ${PROJECT_SOURCE_DIR}/java/classes ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/util/*.java ${PROJECT_SOURCE_DIR}/java/src/main/java/org/rocksdb/*.java ${PROJECT_SOURCE_DIR}/java/src/test/java/org/rocksdb/*.java)
 execute_process(COMMAND ${JAVAH} -cp ${PROJECT_SOURCE_DIR}/java/classes -d ${PROJECT_SOURCE_DIR}/java/include -jni ${NATIVE_JAVA_CLASSES})
 add_library(rocksdbjni${ARTIFACT_SUFFIX} SHARED ${JNI_NATIVE_SOURCES})
 set_target_properties(rocksdbjni${ARTIFACT_SUFFIX} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/rocksdbjni${ARTIFACT_SUFFIX}.pdb")

java/Makefile

@@ -154,9 +154,12 @@ MVN_LOCAL = ~/.m2/repository
 # Set the default JAVA_ARGS to "" for DEBUG_LEVEL=0
 JAVA_ARGS? =
 
+JAVAC_ARGS? =
+
 # When debugging add -Xcheck:jni to the java args
 ifneq ($(DEBUG_LEVEL),0)
 	JAVA_ARGS = -ea -Xcheck:jni
+	JAVAC_ARGS = -Xlint:deprecation -Xlint:unchecked
 endif
 
 SEARCH_REPO_URL?=http://search.maven.org/remotecontent?filepath=
@@ -178,7 +181,7 @@ javalib: java java_test javadocs
 
 java:
 	$(AM_V_GEN)mkdir -p $(MAIN_CLASSES)
-	$(AM_V_at)javac -d $(MAIN_CLASSES)\
+	$(AM_V_at)javac $(JAVAC_ARGS) -d $(MAIN_CLASSES)\
 		$(MAIN_SRC)/org/rocksdb/util/*.java\
 		$(MAIN_SRC)/org/rocksdb/*.java
 	$(AM_V_at)@cp ../HISTORY.md ./HISTORY-CPP.md
@@ -187,7 +190,7 @@ java:
 
 sample: java
 	$(AM_V_GEN)mkdir -p $(SAMPLES_MAIN_CLASSES)
-	$(AM_V_at)javac -cp $(MAIN_CLASSES) -d $(SAMPLES_MAIN_CLASSES) $(SAMPLES_MAIN_SRC)/RocksDBSample.java
+	$(AM_V_at)javac $(JAVAC_ARGS) -cp $(MAIN_CLASSES) -d $(SAMPLES_MAIN_CLASSES) $(SAMPLES_MAIN_SRC)/RocksDBSample.java
 	$(AM_V_at)@rm -rf /tmp/rocksdbjni
 	$(AM_V_at)@rm -rf /tmp/rocksdbjni_not_found
 	java $(JAVA_ARGS) -Djava.library.path=target -cp $(MAIN_CLASSES):$(SAMPLES_MAIN_CLASSES) RocksDBSample /tmp/rocksdbjni
@@ -196,7 +199,7 @@ sample: java
 
 column_family_sample: java
 	$(AM_V_GEN)mkdir -p $(SAMPLES_MAIN_CLASSES)
-	$(AM_V_at)javac -cp $(MAIN_CLASSES) -d $(SAMPLES_MAIN_CLASSES) $(SAMPLES_MAIN_SRC)/RocksDBColumnFamilySample.java
+	$(AM_V_at)javac $(JAVAC_ARGS) -cp $(MAIN_CLASSES) -d $(SAMPLES_MAIN_CLASSES) $(SAMPLES_MAIN_SRC)/RocksDBColumnFamilySample.java
 	$(AM_V_at)@rm -rf /tmp/rocksdbjni
 	java $(JAVA_ARGS) -Djava.library.path=target -cp $(MAIN_CLASSES):$(SAMPLES_MAIN_CLASSES) RocksDBColumnFamilySample /tmp/rocksdbjni
 	$(AM_V_at)@rm -rf /tmp/rocksdbjni
@@ -211,7 +214,7 @@ resolve_test_deps:
 
 java_test: java resolve_test_deps
 	$(AM_V_GEN)mkdir -p $(TEST_CLASSES)
-	$(AM_V_at)javac -cp $(MAIN_CLASSES):$(JAVA_TESTCLASSPATH) -d $(TEST_CLASSES)\
+	$(AM_V_at)javac $(JAVAC_ARGS) -cp $(MAIN_CLASSES):$(JAVA_TESTCLASSPATH) -d $(TEST_CLASSES)\
 		$(TEST_SRC)/org/rocksdb/test/*.java\
 		$(TEST_SRC)/org/rocksdb/util/*.java\
 		$(TEST_SRC)/org/rocksdb/*.java
@@ -224,4 +227,4 @@ run_test:
 
 db_bench: java
 	$(AM_V_GEN)mkdir -p $(BENCHMARK_MAIN_CLASSES)
-	$(AM_V_at)javac -cp $(MAIN_CLASSES) -d $(BENCHMARK_MAIN_CLASSES) $(BENCHMARK_MAIN_SRC)/org/rocksdb/benchmark/*.java
+	$(AM_V_at)javac $(JAVAC_ARGS) -cp $(MAIN_CLASSES) -d $(BENCHMARK_MAIN_CLASSES) $(BENCHMARK_MAIN_SRC)/org/rocksdb/benchmark/*.java