java – GitCommit

Java Dockerfile.

Posted on April 18, 2017April 20, 2017 by BanditPig

Docker – what’s not to like?
Here’s a docker file that installs Java 8 over an Ubuntu base.
It also installs Git and Maven. It takes a little while to build but does provide a full JDK with git and maven.

# Ubuntu  with Java 8 installed.
# Build image with:  docker build  -f Dockerfile_Java8  --rm=true -t=java8
# Run with: docker run -it java8
FROM ubuntu

MAINTAINER Mike
# Using && prevents intermediate containers being generated
RUN apt-get update && \
    apt-get upgrade -y && \
    apt-get install -y  software-properties-common && \
    add-apt-repository ppa:webupd8team/java -y && \
    apt-get update && \
    echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections && \
    apt-get install -y oracle-java8-installer && \
    apt-get clean
  
RUN apt-get install -y git &&  apt-get install -y maven
ENV JAVA_HOME /usr/lib/jvm/java-8-oracle
# Default command
CMD ["bash"]

# Ubuntu with Java 8 installed.

# Build image with: docker build -f Dockerfile_Java8 --rm=true -t=java8

# Run with: docker run -it java8

FROM ubuntu

MAINTAINER Mike

# Using && prevents intermediate containers being generated

RUN apt-get update && \

apt-get upgrade -y && \

apt-get install -y software-properties-common && \

add-apt-repository ppa:webupd8team/java -y && \

apt-get update && \

echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections && \

apt-get install -y oracle-java8-installer && \

apt-get clean

RUN apt-get install -y git && apt-get install -y maven

ENV JAVA_HOME /usr/lib/jvm/java-8-oracle

# Default command

CMD ["bash"]

To help remove unwanted images and stop any and all running containers here are two bash scripts.

#!/bin/bash
#
# removes all images
docker rm -f $(docker ps -a -q)
docker rmi $(docker images -q)

#!/bin/bash

# removes all images

docker rm -f $(docker ps -a -q)

docker rmi $(docker images -q)

#!/bin/bash
#
# force stop any running containers
docker rm -f $(docker ps -a -q)

#!/bin/bash

# force stop any running containers

docker rm -f $(docker ps -a -q)

Execution Statistics.

Posted on April 6, 2017April 6, 2017 by BanditPig

Recently I needed to find a way of logging the execution statistics of a number of methods in Java classes. The execution statistics included such things as number of invocations per unit of time, the longest and shortest execution time, the accumulated execution time per method etc. This needed to be done in a non-intrusive way – i.e. no direct modification of the code under examination. This type of orthogonal processing what AspectJ is designed for. A way to use AspectJ for this is now described. The steps are Setup Maven pom.xml with the required dependencies and the AspectJ build Read More

Configuring an Embedded Tomcat Instance.

Posted on March 20, 2017May 21, 2017 by BanditPig

An ongoing project I’m working on involves setting up SAML based Single Sign On (SSO). At the core of this task is a legacy REST system that uses Netty and has its own http request dispatch system along with a tightly coupled persistence framework. Essentially the system does not have an application server that could have been used to process SAML’s Web Browser profile – a widely used means of obtaining authorisation from a SAML Identity Provider (IdP). I decided to investigate running Tomcat in embedded mode and so be able to use it for handling SAML messages. So this Read More

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Tag: java

Java Dockerfile.

Execution Statistics.

Configuring an Embedded Tomcat Instance.