Copy missing 'tools.jar' to Oracle JRE.

Author: AlexeyKuznetsov-DD

Dockerfile

@@ -71,6 +71,9 @@ RUN <<-EOT
 	sudo curl -L --fail "https://javadl.oracle.com/webapps/download/AutoDL?BundleId=252034_8a1589aa0fe24566b4337beee47c2d29" | sudo tar -xvzf - -C /usr/lib/jvm/oracle8 --strip-components 1
 EOT
 
+# Copy missing 'tools.jar' to Oracle JRE.
+COPY --from=azul/zulu-openjdk:8 /usr/lib/jvm/zulu8/lib/tools.jar /usr/lib/jvm/oracle8/lib/tools.jar
+
 # Install Ubuntu's OpenJDK 17 and fix broken symlinks:
 # some files in /usr/lib/jvm/ubuntu17 are symlinks to /etc/java-17-openjdk/, so we just copy all symlinks targets.
 RUN <<-EOT