Which one to use OpenJDK or OracleJDK?

With Java 11 release, there is no difference between OpenJDK and OracleJDK. All the features and licenses are exactly the same. Oracle has moved the Java license from BCL to GPL2 (+ ClassPath Exception ) license which is the same license used by OpenJDK as well.

Broadly, I can categorize them based on my understanding:

1. OpenJDK
2. OracleJDK for free 
3. OracleJDK with commercial - Java SE subscription Model. 

When to use what?

• Use OpenJDK if you want to customize VM and language features and package it with your product.
• If you don’t want to make any changes in JDK and VM, also not looking for any support from Oracle - then prefer OracleJDK for free.
• If you have many applications which are still running with the older JDK versions like 6,7,8 which are not under LTS now, but you are still looking for security updates and support from Oracle - then go for OracleJDK with a commercial support.

Earlier, there were some commercial features(Heap Analyzer, Java Flight recorder,etc.) in OracleJDK but after Java 9 they slowly offloaded commercial features from the OracleJDK and contributed to OpenJDK.

Now with Java 11 - features, licenses and release cycle dates everything is same! 

Resources:

https://blogs.oracle.com/java-platform-group/oracle-jdk-releases-for-java-11-and-later

http://mail.openjdk.java.net/pipermail/discuss/2017-September/004281.html

Long live Java!!

How to run a sprint retrospective

This is a very nice post on how to run a sprint retrospective meeting
https://thedigitalprojectmanager.com/how-run-sprint-retrospective/

Git commit message format standards

Here is my earlier post on this:
https://exploreeclipse.blogspot.com/2012/11/template-for-git-messages.html


Here is something new which I found. Probably, industry will align with these standards sooner or later.
https://www.conventionalcommits.org

Format suggested:

<type>[optional scope]: <description>

[optional body]

[optional footer]

The commit contains the following structural elements, to communicate intent to the consumers of your library:

1. fix: a commit of the type fix patches a bug in your codebase (this correlates with PATCH in semantic versioning).
2. feat: a commit of the type feat introduces a new feature to the codebase (this correlates with MINOR in semantic versioning).
3. BREAKING CHANGE: a commit that has the text BREAKING CHANGE: at the beginning of its optional body or footer section introduces a breaking API change (correlating with MAJOR in semantic versioning). A breaking change can be part of commits of any type. e.g., a fix:, feat: & chore: types would all be valid, in addition to any other type.
4. Others: commit types other than fix: and feat: are allowed, for example commitlint-config-conventional (based on the the Angular convention) recommends chore:, docs:, style:, refactor:, perf:, test:, and others. We also recommend improvement for commits that improve a current implementation without adding a new feature or fixing a bug. Notice these types are not mandated by the conventional commits specification, and have no implicit effect in semantic versioning (unless they include a BREAKING CHANGE, which is NOT recommended). 
   A scope may be provided to a commit’s type, to provide additional contextual information and is contained within parenthesis, e.g., feat(parser): add ability to parse arrays.

How to download Maven project pom.xml dependencies to a specific folder

Maven offers dependency:copy-dependencies command to download the project dependencies.

Check this here: https://maven.apache.org/plugins/maven-dependency-plugin/examples/copying-project-dependencies.html

$ mvn dependency:copy-dependencies -DoutputDirectory=<your target directory>

For example:

I want to download the project dependencies to google-closure project/plugin dependencies.

Steps:

1. First navigate to the project directory

2. Make sure you have pom.xml specified in the directory

3. Run the below command with the target directory location

$ mvn dependency:copy-dependencies -DoutputDirectory=/Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2

ITEM-AX40113:com.google.javascript kkolipaka$ mvn dependency:copy-dependencies -DoutputDirectory=/Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2

[INFO] Scanning for projects...

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-surefire-plugin/2.17/maven-surefire-plugin-2.17.pom (5.0 kB at 1.8 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-javadoc-plugin/2.10.4/maven-javadoc-plugin-2.10.4.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-javadoc-plugin/2.10.4/maven-javadoc-plugin-2.10.4.jar

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-javadoc-plugin/2.10.4/maven-javadoc-plugin-2.10.4.jar (415 kB at 259 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-source-plugin/3.0.1/maven-source-plugin-3.0.1.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-source-plugin/3.0.1/maven-source-plugin-3.0.1.pom (5.7 kB at 11 kB/s)

[INFO] 

[INFO] ------------------------------------------------------------------------

[INFO] Building Closure Compiler v20181008

[INFO] ------------------------------------------------------------------------

[INFO] 

[INFO] --- maven-dependency-plugin:2.8:copy-dependencies (default-cli) @ closure-compiler ---

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.pom (4.2 kB at 7.9 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-doxia-tools/1.0.2/maven-doxia-tools-1.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/commons-io/commons-io/1.4/commons-io-1.4.pom

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Downloading from central: https://repo.maven.apache.org/maven2/commons-validator/commons-validator/1.2.0/commons-validator-1.2.0.pom

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Downloading from central: https://repo.maven.apache.org/maven2/commons-beanutils/commons-beanutils/1.7.0/commons-beanutils-1.7.0.pom

Downloaded from central: https://repo.maven.apache.org/maven2/commons-beanutils/commons-beanutils/1.7.0/commons-beanutils-1.7.0.pom (357 B at 668 B/s)

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Downloading from central: https://repo.maven.apache.org/maven2/commons-digester/commons-digester/1.6/commons-digester-1.6.pom

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Downloading from central: https://repo.maven.apache.org/maven2/commons-beanutils/commons-beanutils/1.6/commons-beanutils-1.6.pom

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Downloading from central: https://repo.maven.apache.org/maven2/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.pom

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Downloading from central: https://repo.maven.apache.org/maven2/xml-apis/xml-apis/2.0.2/xml-apis-2.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/file-management/1.2.1/file-management-1.2.1.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-shared-io/1.1/maven-shared-io-1.1.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-shared-components/8/maven-shared-components-8.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-shared-components/8/maven-shared-components-8.pom (2.7 kB at 5.0 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-parent/7/maven-parent-7.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.0.2/maven-artifact-2.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven/2.0.2/maven-2.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact-manager/2.0.2/maven-artifact-manager-2.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-repository-metadata/2.0.2/maven-repository-metadata-2.0.2.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/1.0-alpha-6/wagon-provider-api-1.0-alpha-6.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/1.0-alpha-6/wagon-provider-api-1.0-alpha-6.pom (588 B at 1.1 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon/1.0-alpha-6/wagon-1.0-alpha-6.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.4.6/plexus-utils-1.4.6.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-project/2.0.5/maven-project-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-project/2.0.5/maven-project-2.0.5.pom (1.8 kB at 3.4 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven/2.0.5/maven-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven/2.0.5/maven-2.0.5.pom (5.7 kB at 11 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-settings/2.0.5/maven-settings-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-settings/2.0.5/maven-settings-2.0.5.pom (1.7 kB at 3.1 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-model/2.0.5/maven-model-2.0.5.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-profile/2.0.5/maven-profile-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-profile/2.0.5/maven-profile-2.0.5.pom (1.7 kB at 3.1 kB/s)

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-repository-metadata/2.0.5/maven-repository-metadata-2.0.5.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.0.5/maven-artifact-2.0.5.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.0.5/maven-artifact-2.0.5.pom (727 B at 1.3 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-artifact/2.0.8/maven-artifact-2.0.8.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/maven-plugin-api/2.0.8/maven-plugin-api-2.0.8.pom

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-invoker/2.0.11/maven-invoker-2.0.11.pom

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-invoker/2.0.11/maven-invoker-2.0.11.pom (5.1 kB at 9.4 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-impl/2.0.5/maven-reporting-impl-2.0.5.jar

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Downloading from central: https://repo.maven.apache.org/maven2/commons-io/commons-io/1.4/commons-io-1.4.jar

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Downloading from central: https://repo.maven.apache.org/maven2/commons-beanutils/commons-beanutils/1.7.0/commons-beanutils-1.7.0.jar

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Downloading from central: https://repo.maven.apache.org/maven2/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar

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Downloading from central: https://repo.maven.apache.org/maven2/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/3.0.9/plexus-utils-3.0.9.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/file-management/1.2.1/file-management-1.2.1.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-shared-io/1.1/maven-shared-io-1.1.jar

Downloaded from central: https://repo.maven.apache.org/maven2/xml-apis/xml-apis/1.0.b2/xml-apis-1.0.b2.jar (109 kB at 52 kB/s)

Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/1.0-alpha-6/wagon-provider-api-1.0-alpha-6.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar

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Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-invoker/2.0.11/maven-invoker-2.0.11.jar

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Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.0.6/plexus-io-2.0.6.jar (58 kB at 21 kB/s)

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar (27 kB at 9.6 kB/s)

Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-invoker/2.0.11/maven-invoker-2.0.11.jar (29 kB at 10 kB/s)

[INFO] Copying guava-testlib-25.1-jre.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/guava-testlib-25.1-jre.jar

[INFO] Copying gson-2.7.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/gson-2.7.jar

[INFO] Copying guava-25.1-jre.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/guava-25.1-jre.jar

[INFO] Copying ant-1.9.7.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/ant-1.9.7.jar

[INFO] Copying args4j-2.0.26.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/args4j-2.0.26.jar

[INFO] Copying protobuf-java-3.0.2.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/protobuf-java-3.0.2.jar

[INFO] Copying checker-qual-2.0.0.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/checker-qual-2.0.0.jar

[INFO] Copying truth-0.41.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/truth-0.41.jar

[INFO] Copying j2objc-annotations-1.1.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/j2objc-annotations-1.1.jar

[INFO] Copying jsr305-3.0.1.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/jsr305-3.0.1.jar

[INFO] Copying junit-4.12.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/junit-4.12.jar

[INFO] Copying animal-sniffer-annotations-1.14.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/animal-sniffer-annotations-1.14.jar

[INFO] Copying closure-compiler-externs-v20181008.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/closure-compiler-externs-v20181008.jar

[INFO] Copying error_prone_annotations-2.3.1.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/error_prone_annotations-2.3.1.jar

[INFO] Copying mockito-core-2.2.21.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/mockito-core-2.2.21.jar

[INFO] Copying jsinterop-annotations-1.0.0.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/jsinterop-annotations-1.0.0.jar

[INFO] Copying auto-value-1.4.1.jar to /Users/kkolipaka/eclipse-workspace_development_luna/com.google.javascript/lib2/auto-value-1.4.1.jar

[INFO] ------------------------------------------------------------------------

[INFO] BUILD SUCCESS

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 33.342 s

[INFO] Finished at: 2018-10-22T16:45:22+08:00

[INFO] Final Memory: 19M/252M

[INFO] ------------------------------------------------------------------------

Java 11 support for the Eclipse

Java 11 support is added for Eclipse. Remember, this is not part of the simultaneous Release "Eclipse 2018-09(4.9)", so we need to update the eclipse using the update site which provides the support for "Java 11" language features such as lambda with var type in the JDT and to see "Complier compliance level" support for Java 11 in the Java Compiler preferences.

https://marketplace.eclipse.org/content/java-11-support-eclipse-2018-09-49

Update site:
http://download.eclipse.org/eclipse/updates/4.9-P-builds

This is also part of the Eclipse 4.10 integration builds
http://download.eclipse.org/eclipse/downloads/

Download from here:

https://marketplace.eclipse.org/content/java-11-support-eclipse-2018-09-49

Eclipse Simultaneous Release 2018-09 is now "Eclipse 4.9"

I was expecting Eclipse 4.9 sometime during June, 2019 as part of the Eclipse annual release cycle. It's kind of surprising for me when I heard about Eclipse Simultaneous Release 2018-09 (SimRel 2018-09 ) is now called as "Eclipse 4.9" 

Each annual release typically occurs in June, with follow-up update releases in September (*.1), December (*.2), and March (*.3). 

Whatever, let's welcome "Eclipse 4.9" and it's time for one more upgrade!

Here are New and Noteworthy changes in the Eclipse 4.9

http://www.eclipse.org/eclipse/news/4.9/

More FAQ's here on the naming convention for Simultaneous Release:
https://wiki.eclipse.org/SimRel/Simultaneous_Release_Cycle_FAQ


More interesting part is here from the above link:

The releases will be named following the pattern year.month: SimRel YYYY-MM.

For instance SimRel 2018-09, SimRel 2018-12, SimRel 2019-03, SimRel 2019-06…

Note that unlike past years, the name will no longer change annually with an alphabetically increasing name (Kepler, Luna, Mars, Neon, Oxygen, Photon) but will instead remain the singular name of the train.

See the discussion in Bugzilla : https://bugs.eclipse.org/bugs/show_bug.cgi?id=532220.

Snapshot of Java 11 Features

New features from the developer’s perspective:

321: HTTP Client (Standard)

323: Local-Variable Syntax for Lambda Parameters

330: Launch Single-File Source-Code Programs

332: Transport Layer Security (TLS) 1.3

320: Remove the Java EE and CORBA Modules

I think the most important feature from above is, HTTP Client API. As you must aware there are a number of existing HTTP client API’s and implementations exist, e.g. Jetty and the Apache Http Client – In fact, I was using Apache Http Client since there was no standardized API from the Java. 

Other important thing here is - Removal of Java EE and CORBA modules. Many projects still using JAXB API's and now they need to package them as third-party jars.

Memory and Performance tuning:

318: Epsilon: A No-Op Garbage Collector

333: ZGC: A Scalable Low-Latency Garbage Collector

   (Experimental)

331: Low-Overhead Heap Profiling

However, none of them impact the hotspot GC. Those are introduced to address various use cases especially for testing and performance tuning and need to enable them through specific flags.

Deprecated Features:

1.    335: Deprecate the Nashorn JavaScript Engine

2.    336: Deprecate the Pack200 Tools and API

Lot of people uses the Nashron JS engine to run the JS code from the Java – this might be a huge impact for those people.