DISCLAIMER

By using this script you agree to the license agreement specified for all versions of the Oracle or Zulu JDK you invoke this script for. The author(s) assume no responsibility for compliance with the Oracle or Zulu JDK license agreement or any other applicable agreements. Please see LICENSE for additional conditions of use.

Provides automatic download, unpacking and usage of specific JDK versions to facilitate repeatable zero-prerequisite builds of Java based software.

1. Download jdk-wrapper.sh from the latest release script into your project in the directory where you execute your build from (typically the project root directory).

2. Make the jdk-wrapper.sh executable (e.g. chmod +x jdk-wrapper.sh).

3. Create a .jdkw file in the same directory as jdk-wrapper.sh.

4. Populate the .jdkw file with contents from the table below. Customize the file contents by referring to the section Version and Build for information on how to discover and specify a particular JDK version.

5. Execute your build command by wrapping it: ./jdk-wrapper.sh <BUILD COMMAND>.

6. Periodically update the contents of your .jdkw file to reflect new JDK releases or new releases of JDK Wrapper.

Simply specify the desired JDK version and wrap your command relying on the JDK with a call to the jdk-wrapper.sh script.

The first configuration option is to pass arguments to jdk-wrapper.sh which define the configuration. Any argument that begins with JDKW_ will be considered a configuration parameter, everything starting from the first non-configuration parameter onward is considered part of the command.

> ./jdk-wrapper.sh JDKW_VERSION=0.9.0 JDKW_DIST=oracle JDKW_VERSION=8u121 JDKW_BUILD=b13 JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441 <CMD>

Alternatively, you can set these parameters as part of the environment. For example:

> JDKW_DIST=oracle JDKW_VERSION=8u121 JDKW_BUILD=b13 JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441 ./jdk-wrapper.sh <CMD>

Instead of setting the environment variables on the command line you can set them in your session.

> export JDKW_DIST=oracle
> export JDKW_VERSION=8u121
> export JDKW_BUILD=b13
> export JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441
> ./jdk-wrapper.sh <CMD>

Alternatively, create a .jdkw file in the working directory for per-project configuration (recommended).

JDKW_DIST=oracle
JDKW_VERSION=8u131
JDKW_BUILD=b11
JDKW_TOKEN=d54c1d3a095b4ff2b6607d096fa80163

You can override the directory by specifying the JDKW_BASE_DIR configuration either in the environment or on the command line. Since this value controls where to find the the .jdkw file it is the only configuration value that cannot be loaded from a file. For example:

> ./jdk-wrapper.sh JDKW_BASE_DIR=/usr/local/etc <CMD>

Lastly, you can also specify configuration values in a .jdkw file in your home directory for per-user configuration (e.g. for OTN credentials).

JDKW_DIST=oracle
JDKW_VERSION=8u121
JDKW_BUILD=b13
JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441

Once you have configured JDK Wrapper execute jdk-wrapper.sh script passing in your command and its arguments.

> ./jdk-wrapper.sh <CMD>

Finally, any combination of these four forms of configuration is permissible. The order of precedence for configuration from highest to lowest is:

1. Command Line
2. Environment
3. .jdkw (working directory)
4. .jdkw (jdk-wrapper.sh directory)
5. ~/.jdkw (home directory)

The wrapper script will download and cache the specified JDK version and set JAVA_HOME appropriately before executing the specified command.

Regardless of how the configuration is specified it supports the following:

• JDKW_DIST : Distribution type (e.g. oracle, zulu, adopt). Required.
• JDKW_VERSION : Version identifier (e.g. '8u65'). Required.
• JDKW_BUILD : Build identifier (e.g. 'b17'). Required.
• JDKW_TOKEN : Download token (e.g. e9e7ea248e2c4826b92b3f075a80e441). Optional.
• JDKW_RELEASE : Version of JDK Wrapper (e.g. 0.9.0 or latest). Optional.
• JDKW_JCE : Include Java Cryptographic Extensions (e.g. false). Optional.
• JDKW_TARGET : Target directory (e.g. '/var/tmp'). Optional.
• JDKW_PLATFORM : Platform specifier (e.g. 'linux-x64'). Optional.
• JVM_IMPL : Specifies the jvm implementation of the jdk (must be one of 'hotspot' or 'openj9'). Mandatory, if JDKW_DIST is 'adopt'.
• JDKW_LIBC : Libc implementation (e.g. 'musl'). Optional.
• JDKW_EXTENSION : Archive extension (e.g. 'tar.gz'). Optional.
• JDKW_SOURCE : Source url format for download. Optional.
• JDKW_USERNAME: Username for OTN sign-on. Optional.
• JDKW_PASSWORD: Password for OTN sign-on. Optional.
• JDKW_BASE_URI: The source for JDK Wrapper releases. Optional.
• JDKW_VERBOSE : Log wrapper actions to standard out. Optional.

The default JDK Wrapper release is latest.
The default target directory is ~/.jdk.
The default platform is detected using uname.
The default libc is detected using ldd.
By default the Java Cryptographic Extensions are included*.
By default the extension depends on the distribution and platform type.

• dmg is used for Darwin (MacOS)
• tar.gz is used for Linux
• tar.gz is used for Solaris
• exe is used under Oracle for Windows
• zip is used under Zulu for Windows By default the source url is from the distribution type provider.
  By default the wrapper does not log.

NOTE: As of JDK version 9 the Java Cryptographic Extensions are bundled with the JDK and are not downloaded separately. Therefore, the value of JDKW_JCE is ignored for JDK 9. The JDKW_JCE flag only applies if JDKW_DIST is oracle.

NOTE: The libc implementation only applies to select version of the Zulu distribution on the 64-bit Linux platform. See Zulu Releases.

IMPORTANT: The JDKW_TOKEN is required for oracle release 8u121-b13 and newer except it is not required for oracle release JDK 9.0.1 but is required for other JDK 9 releases (as of 2/4/18). JDKW_TOKEN does not apply to zulu.

Additionally, there is the JDKW_BASE_DIR configuration value which is only loaded from the environment or command line with the command line value having higher precedence. This configuration value overrides the path where to locate the .jdkw file which by default is the current working directory. This is useful in situations where you cannot cd into the project directory or if you have a shared .jdkw file for multiple projects.

The desired version and build of the Oracle JDK may be determined as follows:

• Browse to the Java SE Downloads page.
• Click the "JDK Download" button on the right.
• Locate the desired version.
• Accept the associated license agreement.
• Hover over one of the download links.

This page only contains the latest versions. Archived versions can be found here:

Archived versions of JDK9 are listed here. Archived versions of JDK8 are listed here. Archived versions of JDK7 are listed here.

However, these pages require an OTN account to access and to use this script with. Please see Oracle Technology Network at the end of this document for details.

All the links for JDK 7 and JDK 8 contain a path element named {MAJOR}u{MINOR}-{BUILD}, for example 8u73-b02 where 8u73 would be used as the value for JDKW_VERSION and b02 the value for JDKW_BUILD. For versions 8u121-b13 and higher, the link contains an alpha-numeric path segment that looks like e9e7ea248e2c4826b92b3f075a80e441 which needs to be set as the JDKW_TOKEN.

However, Oracle changed their conventions again with JDK 9. For versions 9.0.1 and higher, the path element is named the {X}.{Y}.{Z}+{BUILD}, for example 9.0.1+11 where 9.0.1 would be used as the value for JDKW_VERSION and 11 the value for JDKW_BUILD. Also, JDKW_TOKEN was not needed for 9.0.1 but is required for 9.0.4 and newer.

The desired version of the build of the Zulu (aka Open) JDK may be determined as follows:

• Browse to one of Mac Downoads or Linux Downloads
• Locate the desired version.
• Hover over one of the download links.

All the links contain a path element named zulu{X}.{Y}.{Z}.{W}-jdk{A}.{B}.{C}, for example zulu8.25.0.3-jdk8.0.153 where 8.0.153 would be used as the value for JDKW_VERSION and 8.25.0.3 the value for JDKW_BUILD.

If the Zulu version is followed by -ca it designates a community build. Official releases (without -ca) are preferred, but JDK Wrapper will automatically try community builds as an alternate download. Specifically, zulu{X}.{Y}.{Z}.{W}-ca-jdk{A}.{B}.{C}.

Finally, select 64-bit Linux builds are available for the musl libc implementation. These are selected automatically if ldd indicates that the libc implementation is musl. This behavior can be overriden by setting JDKW_LIBC to either musl or glibc.

See Zulu Release Notes for more information.

The desired version of the build of the AdoptOpenJDK can be one of the Release List.

All releases of JDK 8 and earlier have the format jdk{X}u{Y}-b{Z}. Everything before the minus corresponds to JDKW_VERSION and everything after the minus corresponds to JDKW_BUILD.

All releases of JDK 8 and earlier have the format jdk-{X}+{Z}. Everything before the plus corresponds to JDKW_VERSION and everything after the plus corresponds to JDKW_BUILD.

Note, that AdoptOpenJDK comes in two variants, e.g. Hotspot (the default jvm implementation) and OpenJ9. Therefore, JVM_IMPL needs to be set, if you choose AdoptOpenJDK. If you are not sure what to use, choose Hotspot.

The JDK versions specified over all invocations of the JDK Wrapper script are cached in the directory specified by JDKW_TARGET variable in perpetuity. It is recommended that you purge the cache periodically to prevent it from growing unbounded.

There are three changes necessary to use the jdk-wrapper.sh script in your Travis build. First, ensure that the JDKW_TARGET is configured as a cache directory:

cache:
  directories:
  - $HOME/.jdk

Second, if your project does not use .jdkw file then configure the JDKW_VERSION and JDKW_BUILD environment variables to specify the JDK to use:

env:
  global:
  - JDKW_DIST=oracle
  - JDKW_VERSION=8u121
  - JDKW_BUILD=b13
  - JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441

To create a matrix build against multiple versions of the JDK simply specify the environment variables like this:

env:
  - JDKW_DIST=oracle JDKW_VERSION=7u79 JDKW_BUILD=b15
  - JDKW_DIST=oracle JDKW_VERSION=8u121 JDKW_BUILD=b13 JDKW_TOKEN=e9e7ea248e2c4826b92b3f075a80e441

Remember you can omit fields like JDKW_VERSION and JDKW_DIST if you have a .jdkw file which defines them. Finally, invoke your build command using the JDK Wrapper script. The following assumes you have downloaded and included jdk-wrapper.sh in your project.

script:
- ./jdk-wrapper.sh mvn install

Alternatively, you may download the latest (possibly unreleased) version and execute it as follows (however, this is not recommended):

script:
- curl -s https://raw.githubusercontent.com/koskilabs/jdk-wrapper/master/jdkw-impl.sh | bash /dev/stdin mvn install

If your repository contains a .jdkw properties file it is not sufficient to set the environment variables to create a matrix build because the .jdkw properties file will override the environment variables. Instead you must set the environment variables and then pass them as arguments to jdk-wrapper.sh because arguments have higher precedence than the .jdkw file as follows:

script:
- ./jdk-wrapper.sh JDKW_DIST=oracle JDKW_VERSION=${JDKW_VERSION} JDKW_BUILD=${JDKW_BUILD} JDKW_TOKEN=${JDKW_TOKEN} mvn install

This is most commonly the case when you have a JDK version that you develop against (typically the latest) specified in .jdkw but desire a build which validates against multiple (older) JDK versions.

If you are part of an organization, it may be beneficial to download and store the JDK versions your team uses to a shared location and to distribute from this location to individual team members via JDK Wrapper. Often this reduces latency and bandwidth consumption as well as ensuring that your team has the desired version of the JDK available even if it is no longer available upstream. You can do this by configuring the JDKW_SOURCE parameter in your .jdkw file to define the url pattern for your repository.

One or more persons in your organization would be responsible for downloading new versions of the JDK from the desired vendor(s) and uploading these to your repository. Once available, others can consume them from your repository. This strategy is particularly useful for archived Oracle packages which require an OTN account to download (see Oracle Technology Network below). Specifically, it may be less desirable to either require that all the members of your organization have OTN accounts or to distribute and manage shared OTN credentials. In fact, such strategies may even be contrary to the OTN or other Oracle terms of service (adherence to which you and your organization are solely responsible for).

To avoid renaming the artifacts from Oracle and Zulu here are example JDKW_SOURCE values for different versions:

Oracle JDK 7 and JDK 8:

https://artifactory.example.com/jdk/${JDKW_DIST}/jdk-${JDKW_VERSION}-${JDKW_PLATFORM}.${JDKW_EXTENSION}

Oracle JDK 9:

https://artifactory.example.com/jdk/${JDKW_DIST}/jdk-${JDKW_VERSION}_${JDKW_PLATFORM}_bin.${JDKW_EXTENSION}

Zulu:

https://artifactory.example.com/jdk/${JDKW_DIST}/zulu${JDKW_BUILD}-jdk${JDKW_VERSION}-${JDKW_PLATFORM}.${JDKW_EXTENSION}

You can also vend JDK Wrapper itself from a local repository by setting JDKW_BASE_URI. The expectation is that jdk-wrapper.sh and jdkw-impl.sh are found at this location:

${JDKW_BASE_URI}/releases/download/${JDKW_RELEASE}/

Where JDKW_RELEASE is the version (e.g. 0.13.6). You cannot use latest as a version in this scenario unless the specified URI also responds to latest version translation requests in a Github compatible manner. Like this:

curl -f -k -L -H 'Accept: application/json' https://github.com/KoskiLabs/jdk-wrapper/releases/latest

Results in:

{"id":26612006,"tag_name":"0.13.6","update_url":"/KoskiLabs/jdk-wrapper/releases/tag/0.13.6","update_authenticity_token":"lIVbHJWx1RNJqrgE8xkmJTLdfXSG2ZeWh10WIDwXdjm5GtiCPm/TWQkAKhqNOQ2ZBIaKLKBW03FseOxUTJgD+w==","delete_url":"/KoskiLabs/jdk-wrapper/releases/tag/0.13.6","delete_authenticity_token":"AAs8/a23Y9l0i83hSPIqxcoYGpsRUBpBSKhrbx6PB/K1AAqT7p89aOhYcNS+VWf2ZrSfLqEoR8vf1elrkd1xWQ==","edit_url":"/KoskiLabs/jdk-wrapper/releases/edit/0.13.6"}

You can also vend JDK Wrapper itself from the local filesystem by setting JDKW_BASE_URI to file:https://<PATH>. The expectation is that jdk-wrapper.sh and jdkw-impl.sh are found at the location specified by <PATH>. When vending JDK Wrapper from the file system the default value of JDKW_RELEASE becomes snapshot and not latest since there is no way (currently) to resolve latest when loading from the filesystem. Furthermore, whenever JDKW_RELEASE is set to snapshot the cached version of JDK Wrapper is always replaced from JDKW_BASE_URI. If you have a stable version of JDK Wrapper on the filesystem then you should also set JDKW_RELEASE to some value (e.g. current) to avoid the refresh on each execution of JDK Wrapper.

There are four common ways to execute shell like JDK Wrapper under Windows: Cygwin, Msys2, MinGW and the new Windows Subsystem for Linux (WSL). When the JDK is installed from an executable (e.g. for Oracle under Cygwin) User Access Control will prompt you to allow the installation. Please disable User Access Control or select a distribution with a non-executable Windows installation (e.g. Zulu).

Cygwin is a collection of tools which provide a Linux like environment in Windows by providing a POSIX compatibility layer between the Cygwin environment and the Windows environment. Under Cygwin JDK Wrapper downloads and installs the Windows JDK.

Msys2 is second version of the Minimalist GNU For Windows (MinGW; see below), this version takes a different approach by providing a POSIX compatibility layer using Cygwin libraries while still providing the MinGW compiler for creating native Windows applications. Under Msys JDK Wrapper downloads and installs the Windows JDK.

Known Issues:

• There is a known incompatibility with the /bin/start script which does not allow more than one argument to be passed. You can find more details and the current status of this issue in MSYS2-packages#1177. The easiest thing to do is patch your local install.

The Windows Subsystem for Linux (WSL) is the latest take on Linux in Windows and is provided by Microsoft itself. You can find more information about WSL including installation instructions on Microsoft's website. In the case of WSL unlike Msys2 or Cygwin, the environment supports execution of actual Linux binaries. This made it more straight forward and also provided better integration with WSL for JDK Wrapper to install the Linux JDK than the Windows one. Under WSL JDK Wrapper downloads and installs the Linux JDK.

The Minimalist GNU for Windows or MinGW provides utilities and tools compiled for and running natively on Windows. MinGW does not provide a POSIX compatible environment. Fortunately, JDK Wrapper does not require a full POSIX environment. After installing MinGW, you must download and compile from source: curl and its dependencies zlib, pthreads, openssl and libssh2. Although not supported, under MinGW JDK Wrapper downloads and installs the Windows JDK.

Known Issues:

• Similar to Msys2 there is a known incompatibility with the /bin/start script which does not allow more than one argument to be passed. You can find more details and the current status of this issue in mingw#1963. The easiest thing to do is patch your local install.

The jdk-wrapper script may work with other versions or with suitable replacements but has been tested with these:

• posix shell: bash (4.4.12), BusyBox (1.25.1)
• awk (4.1.4)
• curl (7.51.0)
• grep (3.0)
• sed (4.4)
• sort (8.27)
• sha256sum (8.29) or shasum (5.84) or sha1sum (8.27) or md5

Plus tools for extracting files from the target archive type (e.g. tar.gz, dmg, etc.) such as gzip, tar or xar (for example).

IMPORTANT: Sometime in May 2017 Oracle started requiring an Oracle Technology Network (OTN) account for downloading anything but the latest JDK version. To work around this either:

1. Manually download and cache the JDKs elsewhere (e.g. Artifactory, Nexus, S3, etc.) and use the JDKW_SOURCE to specify the location. For example:

   JDKW_SOURCE='https://artifactory.example.com/jdk/${JDKW_DIST}/jdk-${JDKW_VERSION}-${JDKW_PLATFORM}.${JDKW_EXTENSION}' JDKW_DIST=oracle JDKW_VERSION=8u121 JDKW_BUILD=b13 jdk-wrapper.sh

Take care with this option since the Oracle JDK archive naming convention can change between versions (e.g. from 8 to 9).

2. Specify OTN credentials by using the JDKW_USERNAME and JDKW_PASSWORD arguments. For example:

   JDKW_USERNAME=[email protected] JDKW_PASSWORD=secret JDKW_DIST=oracle JDKW_VERSION=8u121 JDKW_BUILD=b13 jdk-wrapper.sh

The command above is for illustrative purposes only. You should never write your password out as part of a JDK Wrapper command. Instead store your OTN credentials in ~/.jdkw.

3. Switch from Oracle JDK to Open JDK and never deal with this problem again. For example:

   JDKW_DIST=zulu JDKW_BUILD=8.25.0.1 JDKW_VERSION=8.0.152 jdk-wrapper.sh

If the JDK is not found in the local cache, then an attempt is made to download it from the user specified source if provided. If that attempt fails or is skipped, the next attempt uses the publicly available endpoint at Oracle (where only the latest version is available). If that attempt fails, the final step uses the OTN credentials to login and attempt download via the secure OTN endpoint at Oracle if credentials were provided.

You will likely want developers (or some subset of developers) using the OTN login version via the .jdkw file in their home directory (e.g. for testing JDK upgrades before making them available) while other developers and headless builds (e.g. Jenkins, Travis, Code Build, etc.) use your private cloud/on-prem cached version. As with any use of this script you are responsible for compliance with the Oracle JDK (or any other provider) license agreement(s) and the OTN end user license agreement if applicable as well as any other agreements to which you are bound.

• Determine the next release version X.Y.Z using semantic versioning based on changes since the last release.
• Create a tag to mark the release:

$ git tag -a "X.Y.Z" -m "X.Y.Z"

• Push the tag to the origin to trigger the release:

$ git push origin --tags

• Verify the release was created in Github

Published under Apache Software License 2.0, see LICENSE

© Ville Koskela, 2018