Fix registry Docker image: upgrade JRE from 8 to 11

sntiwari1 · claude · sntiwari1 · commit a1b60a791017 · 2026-05-13T11:44:06.000+05:30
The Maven pom has maven.compiler.target=11, producing class file version
55 (Java 11). The old base image frolvlad/alpine-java:jdk8-slim runs
Java 8, which only supports class file versions up to 52. This caused
an UnsupportedClassVersionError on every registry container start,
making port 8081 permanently inaccessible in CI.

Switch to eclipse-temurin:11-jre-alpine which is a well-maintained
JRE 11 Alpine image and matches the compiler target.

Co-Authored-By: Claude Sonnet 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/java/Dockerfile b/java/Dockerfile
@@ -1,4 +1,4 @@
-FROM frolvlad/alpine-java:jdk8-slim
+FROM eclipse-temurin:11-jre-alpine
 #COPY ./java/registry/target/registry.jar /home/sunbirdrc/registry.jar
 COPY ./BOOT-INF/lib /home/sunbirdrc/BOOT-INF/lib
 COPY ./META-INF  /home/sunbirdrc/META-INF

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM frolvlad/alpine-java:jdk8-slim`
	`1`	`+FROM eclipse-temurin:11-jre-alpine`
`2`	`2`	`#COPY ./java/registry/target/registry.jar /home/sunbirdrc/registry.jar`
`3`	`3`	`COPY ./BOOT-INF/lib /home/sunbirdrc/BOOT-INF/lib`
`4`	`4`	`COPY ./META-INF /home/sunbirdrc/META-INF`