Revert: Update to use Java 8 as default

PiperOrigin-RevId: 311574932
Change-Id: If081155bb77a25d60136aab5b56189bc8781d388

Author: Louis Ye

README.md

@@ -66,7 +66,18 @@ ls cdbg_java_agent_gce.tar.gz
 ```
 
 Note that the build script assumes some dependencies. To install these
-dependencies on Debian, run this command:
+dependencies, run this command:
+
+
+**On Debian 8:**
+
+```shell
+sudo apt-get -y -q --no-install-recommends install \
+    curl gcc build-essential libssl-dev unzip openjdk-7-jdk \
+    cmake python maven
+```
+
+**On Debian 9:**
 
 ```shell
 sudo apt-get -y -q --no-install-recommends install \

build.sh

@@ -22,7 +22,7 @@
 # The build script assumes some dependencies.
 # To install those on Debian, run this command:
 # sudo apt-get -y -q --no-install-recommends install \
-#     curl gcc build-essential libssl-dev unzip openjdk-8-jdk \
+#     curl gcc build-essential libssl-dev unzip openjdk-7-jdk \
 #     cmake python maven
 #
 # The Java Cloud Debugger agent uses glog, gflags and jsoncpp libraries.

src/agent/Makefile

@@ -38,7 +38,7 @@ ASM_COMMONS_JAR_PATH ?= /usr/lib/asm-8.0/lib/asm-commons-8.0.jar
 ASM_UTIL_JAR_PATH ?= /usr/lib/asm-8.0/lib/asm-util-8.0.jar
 GOOGLE_API_JAVA_CLIENT_PATH ?= /usr/lib/google-api-java-client
 JAVA_BUILD ?= maven
-JAVAC=javac -source 1.8 -target 1.8
+JAVAC=javac -source 1.7 -target 1.7
 BUILD_TARGET_PATH ?= .
 
 OPT_FLAGS = -O3 -D NDEBUG