I have a situation where my system has one maven installed (e.g version 3.7.1. I have some projects that needs that version so this version is my default and if I build a project using mvn the version 3.7.1 is used by default to build the project.
Now I have to work on a project where it needs maven version 3.8.1 and I am looking for a way to do it. I am planning to install the maven version 3.8.1 in same system and would like to call this maven while building the new project. Can anyone help me on how to add envionment variable for new maven and call it whenever necessary while building without removing the 3.7.1 version
Aside from having separate Maven installations on your system, you could also have a look at the Maven Wrapper.
The maven wrapper allows you to attach a small script to your code base, which downloads and runs a specific version of Maven. In this way there are no dependencies to any Maven installations on your system.
After placing the Maven Wrapper in your project, you would then simply run ./mvnw install instead of mvn install.
I am using SDKMAN to manage different versions of maven or java. SDKMAN is a tool for managing parallel versions of multiple Software Development Kits on most Unix based systems. It provides a convenient Command Line Interface (CLI) and API for installing, switching, removing and listing Candidates.
It is very convenient and this problem no longer exists for me.
I want to get a JDK 8 that was built with debug or fastedebug option to investigate a low-level performance-related problem. To be more specific, I want a JDK 8 64-bit build for Windows that supports -XX:+PrintMethodData option.
However I can't find any public debug-enabled JDK build for Windows. Is my only option to take OpenJDK and build it myself?
PS: I don't need a production quality JDK. I just want to get more info from JIT.
PS2: Related links:
https://github.com/alexkasko/openjdk-unofficial-builds - OpenJDK. Only JDK 6 and 7.
https://github.com/ojdkbuild/ojdkbuild - OpenJDK 8 but no debug versions.
I can't find any public debug-enabled JDK build for Windows.
I added "fastdebug" binaries that match latest "ojdkbuild" release:
direct download: https://github.com/ojdkbuild/ojdkbuild/releases/download/1.8.0.111-1/java-1.8.0-openjdk-fastdebug-1.8.0.111-1.b15.ojdkbuild.windows.x86_64.zip
sha256: https://github.com/ojdkbuild/ojdkbuild/releases/download/1.8.0.111-1/java-1.8.0-openjdk-fastdebug-1.8.0.111-1.b15.ojdkbuild.windows.x86_64.zip.sha256
Debuginfo there is zipped in .diz files in jre/bin and jre/bin/server directories.
Debug binaries are planned for following "ojdkbuild" builds, but not yet implemented in build scripts, see: https://github.com/ojdkbuild/ojdkbuild/issues/7 , if you'll have any specific requirements about debug symbols - I will appreciate comments there.
Is my only option to take OpenJDK and build it myself?
Building vanilla OpenJDK 8 for Windows is relatively easy, just note that it supports only VS2010 (SDK 7.1) toolchain.
According to the requirements document for sonarqube:
The only prerequisite for running SonarQube is to have Java (Oracle JRE 7 onwards or OpenJDK 7 onwards) installed on your machine.
I want now to use a NetBSD 7.0 machine to run a sonarqube server.
OpenJDK8 is installed:
openjdk version "1.8.0_77-internal"
OpenJDK Runtime Environment (build
1.8.0_77-internal-pkgsrc_1.8.77-b00)
OpenJDK 64-Bit Server VM (build 25.77-b00, mixed mode)
However, sonarqube is using wrapper, and that software does not support NetBSD (FreeBSD is supported, but this is not close enough to serve as a working substitute).
I already tried using linux emulation mode. But, having a NetBSD native java being started from a linux emulated wrapper is not giving a usable configuration for runtime environment (libc version clashes, et. al.).
And installing a linux native openjdk8 and get the complete setup running in emulation mode is also not to be recommended.
With sonarqube 4.x (long ago) I had used war distribution
and this worked OK. But with this new environment I hoped for being able to use newer versions of sonarqube.
Questions:
Is there a way to bypass wrapper and start sonarqube relying on java only?
Alternatively, is there a way to get a NetBSD version of wrapper?
Would I be better of dropping sonarqube alltogether,
given my target platform?
The version of Java Service Wrapper used by SonarQube does not support NetBSD. That's not as critical as for MSWindows. SonarQube can be easily started as a unix daemon without it. You just have to execute java -jar lib/sonar-application-{version}.jar from the installation directory.
I want to use GCC 4.8.1 or higher on a HPC machine with CentOS 6.5 which has a very old GCC. I do not have admin rights so everything has to be local. Do I have to really compile everything from source? Isn't there any rpm package that I can only install GCC with its dependencies? I found GCC rpms for CentOS 7 but not 6.5.
Without admin rights, building from source is
likely most reliable means to use gcc-4.8.1.
You can try installing (or extracting) gcc-4.8.1
from the redhat developer tool kit 2.0 described here
https://superuser.com/questions/381160/how-to-install-gcc-4-7-x-4-8-x-on-centos
CentOS 7 RPM's are unlikely to work in general on CentOS 6.x.
The developer 2.0 toolkit was built on CentOS6
I would like to use the WatchService API as mentioned in this link:
http://download.oracle.com/javase/tutorial/essential/io/notification.html
After reading around, I found out that WatchService is part of the NIO class which is scheduled for JDK 7. So, it is in beta form. It's fine.
http://jdk7.java.net/download.html has the JDK which I downloaded and extracted. I got a bunch of folders. I don't know what to do with them.
Then, I read around some more and found that some nice group of people created JDK 7 as a binary so someone like me can install it easily. It is called Open JDK:
http://code.google.com/p/openjdk-osx-build/
So, I downloaded the .dmg file and install it. Then I open "Java Preference" and see that OpenJDK7 is available.
So, now I feel that I can start trying out WatchService API. From the tutorial in the first link, the author gave a .java file to test it out first and make sure that it is running. Here is the link to the file:
http://download.oracle.com/javase/tutorial/essential/io/examples/WatchDir.java
So, I boot up Eclipse (actually I use STS) and create a new Java project and choose JaveSE-1.7 in the "use an execution environment JRE:". Under the src folder, I copy pasted the WatchDir.java file.
And I still see tons of squiggly red lines. All the "import.java.nio.*" are all red and I cannot run it as a Java app.
What do I need to do?
This is how I got 1.7 to work with Eclipse. I hope it helps.
I Downloaded the latest OpenJDK 1.7 universal (32/64 bits) JDK
from Mac OS/X branch from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html
copied the jdk to /Library/Java/JavaVirtualMachines/ next to the
default 1.6.0 one
In Eclipse > Preferences > Java > Installed JREs you add a new one, of type MacOS X VM, and set the home as /Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home and
name Java SE 7 (OpenJDK)
Click Finish
Set the added JRE as default
that should be it :)
Oracle has released JDK 7 for OS X.
Java 9, 10, 11
Years ago, Apple joined the OpenJDK project, transferring their formerly proprietary macOS-specific JVM code as free-of-cost open-source. Apple ceased distribution of their own branded JVM/JDK, relying on Oracle’s branded releases to include a version for macOS.
Oracle has recently announced their intention to bring their Oracle-branded JVM release to feature parity with the OpenJDK project, with virtually the same code base. The company even donated their previously commercial tools, Flight Recorder & Mission Control, to the OpenJDK project. This is part of the shift to a new rapid “release train” plan for predictably scheduled versioning of Java and OpenJDK. Notably, the periods for free-of-cost public updates is now shortened. See this 2017-09 announcement and this posting by Mark Reinhold.
As a result of all this, macOS users of Java have a choice of vendors for a Java implementation. At this point, at least three sources are based on OpenJDK for macOS:
Oracle releases of the JDK and JRE, with optional paid support.
Azul Systems releasing:
Zulu line of free-of-cost JVMs with optional paid support.
Zing line of commercial JVMs with special features such as an alternate garbage-collector.
OpenJDK source code, roll-your-own compilation & installation (perhaps not practical for most of us).
Meanwhile, IBM donated code for a JVM to the Eclipse Foundation, now housed in the OpenJ9 project. I wonder if they might support a macOS release as well, though it is too soon to tell.
Personally, I am currently using the Zulu release of Java 10.0.1 from Azul on macOS High Sierra successfully with IntelliJ 2018.2 to produce Java-backed web apps with Vaadin.
Installation/Removal
Both Oracle and Azul provide utterly easy-to-use installers to install the JVM/JDK on your Mac. Verify your installation by using the Terminal.app (or equivalent) to type and run:
java -version
You will find the Java installations in this folder at the root level of your drive (not in your home folder):
/Library/Java/JavaVirtualMachines
Each version from each vendor is found there, in a labeled nested folder. You can delete any installation simply by deleting the nested folder for that version and providing your system password when prompted.
Java 8
You can download the Java Development Kit (JDK) for Java 8 for the supported versions of Mac OS X:
Mountain Lion (10.8.3+)
Mavericks (10.9)
Yosemite (10.10)
El Capitan (10.11)
Each version of JVM you install can be found here:
/Library/Java/JavaVirtualMachines
For more instructions and FAQ, see this Oracle Guide.
Java 7
For every release of Java 7 since Update 4, a Mac version has been ready alongside the other platforms. Runs on Macs with 64-bit hardware on Lion (10.7.3+), Mountain Lion (10.8.3+), and Mavericks (10.9.x).
Oracle announced the official release of the JDK for Java SE 7 Update 4 on Mac OS X (Lion), as of 2012-04-26. No more need for the tricks discussed on this page.
Installation is simple per these instructions:
Download from the usual place on the Oracle web site.
Mount the DMG.
Run the installer.
This release has a few limitations, most notably the lack of support for Java Web Start and the Java Plugin for web browsers. That support is expected later this year.
After installing, read the JDK for Mac ReadMe. Most importantly, if you want Java 7 to be the default, drag it to the top of the list in the Java Preferences app found in your Utilities folder.
Mac OS X easily supports multiple JVMs simultaneously. Each is now found here:
/Library/Java/JavaVirtualMachines
Congratulations to the Apple & Oracle teams for their achievement. This geek gets a thrill seeing Mac OS X listed as a "Certified System Configuration".
Tip: To start Eclipse on a Mac with only Java 7 installed, open the alias file named eclipse rather than the file named Eclipse.app.
Java 6
Apple continues to supply an up-to-date implementation of Java 6 for all versions of Mac OS X up through Mountain Lion.
If you do something that requires Java, such as type "java -version" in Terminal.app, a dialog appears offering to install Java for you. If you accept, installation happens automatically similar to other "Software Updates" from Apple.
You will find Java installed in this location, different than Java 7 & 8:
/System/Library/Java/JavaVirtualMachines
Java 6 has reached end-of-life with Oracle as of 2013-02 (unless you have a commercial support agreement with Oracle). So you should be moving to Java 7 or 8.
Testing New Version
In Terminal.app, type java -version to verify which version is the current default.
Deleting Old Versions
After installing a fresh version, you may want to visit the folder described above to delete old versions. Move the folder to the Trash, and provide your System password complete the move.
By the way, Apple provides a mailing list for developers’ technical issues related to Java on OS X.
An easy way to install Java 7 on a Mac is by using Homebrew, thanks to the Homebrew Cask plugin (which is now installed by default).
Run this command to install Java 7:
brew cask install caskroom/versions/java7
Get cask
brew tap caskroom/cask
Install java7:
brew tap caskroom/versions
brew cask install java7
(I had difficulty finding the download link of java7 on oracle website, as they're just "recommending" java8 )
EDIT January 2018 (As pointed by Ankur):
Use zulu7 cask. Zulu is a certified build of OpenJDK produced by Azul Systems that should be around for a long time (they even offer JDK6 builds still).
brew cask install caskroom/versions/zulu7
I know that some may want to smack me for re-opening old post, but if you feel so do it I just hope this may help someone else trying to set JDK 7 on Mac OS (using IntelliJ).
What I did to get this working on my machine is to:
followed instructions on Oracle JDK7 Mac OS X Port for general installation
in IntelliJ open/create new project so you can add new SDK (File > Project Structure)
select Platform Settings > SDKs, press "+" (plus) sign to add new SDK
select JSDK and navigate to /Library/Java/JavaVirtualMachines/JDK 1.7.0 Developer Preview.jdk/Contents/Home. Do not get it mistaken with /Users/YOUR_USERNAME/Library/Java/. This will link 4 JARs from "lib" directory (dt.jar, jconsole.jar, sa-jdi.jar and tools.jar)
you will need also add JARs from /Library/Java/JavaVirtualMachines/JDK 1.7.0 Developer Preview.jdk/Contents/Home/jre/lib (charsets.jar, jce.jar, JObjC.jar, jsse.jar, management-agent.jar, resources.jar and rt.jar)
after installing the 1.7jdk from oracle, i changed my bash scripts to add:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_13.jdk/Contents/Home
and then running java -version showed the right version.
It's possible that you still need to add the JDK into Eclipse (STS). Just because the JDK is on the system doesn't mean Eclipse knows where to find it.
Go to
Preferences > Java > Installed JREs
If there is not an entry for the 1.7 JDK, add it. You'll have to point Eclipse to where you installed your 1.7 JDK.
If Eclipse can't find a JRE that is 1.7 compatible, I'm guessing that it just uses your default JRE, and that's probably still pointing at Java 1.6, which would be causing your red squiggly lines.
I needed to adapt #abe312's answer since there has been some changes with brew lately.
I installed zulu7 and setup JAVA_HOME by running:
brew install --cask homebrew/cask-versions/zulu7
echo "export JAVA_HOME=/Library/Java/JavaVirtualMachines/zulu-7.jdk/Contents/Home" >> ~/.zshrc
I had to enter my password for installing zulu7. You may need to modify the last command if you are using a different shell.
How about Netbeans, here is an article how to set it up with NB7:
http://netbeanside61.blogspot.com/2011/06/downloading-openjdk7-binary-for-mac-os.html
Maybe similar steps for Eclipse.
As of April 27th there is an offical Oracle release of Java SE 7u4. Download the disk image and run the installer - then see the Mac readme.
As of December 2017, previously posted links don't work, but JDK 7 can still be downloaded from Oracle Archives (login required):
http://www.oracle.com/technetwork/java/javase/downloads/java-archive-downloads-javase7-521261.html
The instructions by peter_budo worked perfectly. I had to add the jars under /Library/Java/JavaVirtualMachines/JDK 1.7.0 Developer Preview.jdk/Contents/Home/jre/lib/ to my IntelliJ project libraries. Now it works like a charm. Note that I didn't need my IDE itself to run under 1.7; rather, I only needed to be able to compile and run against 1.7. I'll most likely continue to use Apple's JRE for running the IDE since it's probably more stable with respect to graphics routines (Swing, AWT). Like the OP, I was really keen on testing out the new NIO2 API. Looking good so far. Thanks, Peter.
What worked for me on Lion was installing the JDK7_u17 from Oracle, then editing ~/.bash_profile to include:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_13.jdk/Contents/Home
Now, Use command
Update 2020: 04
To install Java7 with homebrew run:
brew tap homebrew/cask-versions
brew cask install java7
Hope this help.
I updated to Yosemite and Android Studio wouldn't clean my projects or Run them on virtual or real device because of the following error:
Failed to complete Gradle execution.Cause:Supplied javaHome is not a valid folder. You supplied: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
After some research and trouble shooting, I found that the JDK file that was being pointed to at "/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home" wasn't there; all of "JavaVirtualMachines/1.6.0.jdk/Contents/Home" was missing from "/System/Library/Java". So, I copied "JavaVirtualMachines/1.6.0.jdk/Contents/Home" over from "/Library/Java/" to "/System/Library/Java/" and cha ching! I was back in business.