Build Java code to be compatible with older Java (#96)

vmax · web-flow · commit 20792156b1b8 · 2020-12-19T13:31:29.000Z
## What is the goal of this PR?

Currently, we compile Protocol on CI with Java 11. This could result in unexpected runtime issues when running on older Java, such as `java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer;` that we experienced.

## What are the changes implemented in this PR?

Pass Java compiler option to produce bytecode compatible with Java 8
diff --git a/.bazelrc b/.bazelrc
@@ -15,7 +15,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 #
 
-build --incompatible_strict_action_env
+build --incompatible_strict_action_env --javacopt='--release 8'
 run --incompatible_strict_action_env
 test --incompatible_strict_action_env
 

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@`
`15`	`15`	`# along with this program. If not, see <https://www.gnu.org/licenses/>.`
`16`	`16`	`#`
`17`	`17`
`18`		`-build --incompatible_strict_action_env`
	`18`	`+build --incompatible_strict_action_env --javacopt='--release 8'`
`19`	`19`	`run --incompatible_strict_action_env`
`20`	`20`	`test --incompatible_strict_action_env`
`21`	`21`