made hotswap/jdwp disablable

Dockerfile

@@ -7,6 +7,8 @@ ENV JAVA_MEMORY_MAX=512m
 ENV JAVA_HOME=/usr/local/lib/jvm/java-openjdk-dcevm
 ENV JRE_HOME=/usr/local/lib/jvm/java-openjdk-dcevm
 ENV JAVA_OPTS=
+ENV ENABLE_HOTSWAP=true
+ENV ENABLE_JDWP=true
 
 # Install curl
 RUN apt update && apt -y install curl

README.md

@@ -25,3 +25,13 @@ It is expected that containers are configured in Maven using the Fabric8 or Spot
 | `/var/lib/jvm/dev/lib-extra7`     | JARs      | No           |
 
 You may include your own `hotswap-agent.properties` in any of the `classes` folders.  The one loaded by default is usually sufficient.
+
+You can specify the following environment variables when running the container.
+
+| Environment Variable | Default Value | Description |
+| -------------------- | ------------- | ----------- |
+| `JAVA_MEMORY_INIT`   | `128m`        | The initial and minimum JVM memory. |
+| `JAVA_MEMORY_MAX`    | `512m`        | The maximum JVM memory allowed. |
+| `ENABLE_HOTSWAP`     | `true`        | Set to `false` to disable the HotSwap agent. |
+| `ENABLE_JDWP`        | `true`        | Set to `false` to disable the Java debugger. |
+| `JAVA_OPTS`          |               | Set to extend the standard `JAVA_OPTS` environment variable. |

docker-entrypoint.sh

@@ -6,4 +6,12 @@ JAVA_CP="${JAVA_CP}:/var/lib/jvm/dev/classes:/var/lib/jvm/dev/classes-extra1:/va
 JAVA_CP="${JAVA_CP}:/var/lib/jvm/dev/lib/*:/var/lib/jvm/dev/lib-extra1/*:/var/lib/jvm/dev/lib-extra2/*:/var/lib/jvm/dev/lib-extra3/*:/var/lib/jvm/dev/lib-extra4/*:/var/lib/jvm/dev/lib-extra5/*:/var/lib/jvm/dev/lib-extra6/*:/var/lib/jvm/dev/lib-extra7/*"
 EXEC_JAVA_OPTS="${JAVA_OPTS} -classpath ${JAVA_CP}"
 
+if [ "${ENABLE_HOTSWAP}" = "true" ]; then
+    EXEC_JAVA_OPTS="${EXEC_JAVA_OPTS} ${HOTSWAP_JAVA_OPTS}"
+fi
+
+if [ "${ENABLE_JDWP}" = "true" ]; then
+    EXEC_JAVA_OPTS="${EXEC_JAVA_OPTS} ${JDWP_JAVA_OPTS}"
+fi
+
 exec ${JAVA_HOME}/bin/java ${EXEC_JAVA_OPTS} ${JAVA_CLASS}

pom.xml

@@ -15,7 +15,7 @@
 
         <!-- The version of Java DCEVM to use for executing Apache Tomcat -->
         <!-- See: https://github.com/TravaOpenJDK/trava-jdk-11-dcevm/releases -->
-        <dcevm.version>11.0.10+4</dcevm.version>
+        <dcevm.version>11.0.10+6</dcevm.version>
         <dcevm.majorVersion>11</dcevm.majorVersion>
 
         <!-- The version of the Hotswap Agent to use -->

setenv.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 JAVA_OPTS="${JAVA_OPTS} -Xms${JAVA_MEMORY_INIT} -Xmx${JAVA_MEMORY_MAX}"
-JAVA_OPTS="${JAVA_OPTS} -XX:HotswapAgent=external -javaagent:/usr/local/lib/jvm/hotswap-agent.jar"
-JAVA_OPTS="${JAVA_OPTS} -agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"
+HOTSWAP_JAVA_OPTS="-XX:HotswapAgent=external -javaagent:/usr/local/lib/jvm/hotswap-agent.jar"
+JDWP_JAVA_OPTS="-agentlib:jdwp=transport=dt_socket,address=8000,server=y,suspend=n"