Due to different servers running different JVM version. I would like to set a specific project to specific JDK version. I'm thinking may be setting JAVA_HOME with a task which compilation depends on it, but I'm not sure how to code it yet. But then there may be a simple setting I can do in build.gradle for that!?
I think you are after sourceCompatibilityand targetCompatibility. Settings those on a project has - as far as compilation is concerned - the same effect than -source and -target parameters to javac. If you need different settings for different compile tasks in one project, even that would be possible.
Related
Installed clean windows10(1607) and intellij idea(2020.1.2 community edition). When i create new gradle project
Invalid Gradle JDK configuration found. Open Gradle Settings
"gradle-wrapper.properties not found".
How can I fix it?
Install gradle 6.7
sdk install gradle 6.7
brew install gradle
Go to IntelliJ and set gradle version:
On File >> Settings >> Build, Execution , Deployment >> Gradle
or
Preferences >> Gradle
In Use Gradke from specific the correct location
If IDEA is set to use the Gradle wrapper (as it is in your screenshot: "Use Gradle from:" is set to "gradle-wrapper.properties"), IDEA expects the following file structure:
Gradle wrapper JAR: [project root]/gradle/wrapper/gradle-wrapper.jar
Gradle wrapper properties: [project root]/gradle/wrapper/gradle-wrapper.properties
Gradle wrapper script: [project root]/gradlew.bat
If you are missing one of these three elements, IDEA will attempt to generate the wrapper by calling the gradle wrapper task. It will do this using the Gradle JDK, which may or may not be the project SDK (File > Settings > Build, Execution, Deployment > Build Tools > Gradle > Gradle JVM).
I'm not sure how it selects the version of Gradle it uses - I only have 6.8.3 installed on my machine, and I had my wrapper properties set to 7.0-rc-1, yet somehow it used 6.7.0 when generating the wrapper.
I tried various options for clearing the cache, but did not get the result.
Openjdk-14 installed by default and does not work. From site adoptopenjdk.net install OpenJDK 11 (LTS). When creating the project, I chose 11 version. Then the program suggested updating gradle to version 6 and it worked.
I ran into this problem a while ago when I upgraded to intellij 2020.* The first time I created a new project there was no problem: gradle daemon did its work and the project was created with no problems.
In my case, the project would start a new gradle daemon, and attempt to build the project, would get rejected by windows Security, and nothing would happen, so intellij goes ahead and starts another (unsuccessful) daemon. Soon, I had 20+ gradle daemon processes running on my system, all of them doing nothing.
So, it looks like intellij has messed in enabling that it places the appropriate permissions it requires for these folders that it depends on to run properly. So, you need to manually give these permissions, and then things (should) work.
The real issue here is security on your machine: either a virus checker or the security software, Windows Security on Windows 10, for example. The first time you make a project, Intellij goes and produces a number of folders that they need access to.
However, once these folders are available, for whatever, intellij doesn't make sure to give itself access.
On windows 10, in AppData, you'll find several folders required by Intellij to produce, in my case, produce gradle projects.
Try finding the various folders that Intellij has produced on your system, and give them exceptions on your virus checker and on whatever firewall/security software programs that may block access.
I'd like to build certain projects without the use of of Gradle daemon. I've read that this can be done either by command-line argument --no-daemon or by changing Gradle properties under .gradle/. I need to disable it for just some of the projects I build under the root project though.
Is it possible via settings.gradle/build.gradle settings or am I better off making custom build script?
You can simply add org.gradle.daemon=false to a gradle.properties file in the project root folder.
The daemon documentation mainly talks about disabling the daemon altogether on a machine but the gradle properties documentation indicates that the location where a property / value pair is declared is irrelevant, they are sourced from different location, with overwrite rules.
I want specify the Java home path during building my Android gradle via command line; for example,
gradle build -d path of jdk
Is it possible?
According to gradle documentation:
The following properties can be used to configure the Gradle build
environment:
...
org.gradle.java.home Specifies the Java home for the Gradle build
process. The value can be set to either a jdk or jre location,
however, depending on what your build does, jdk is safer. A reasonable
default is used if the setting is unspecified.
org.gradle.jvmargs Specifies the jvmargs used for the daemon process.
The setting is particularly useful for tweaking memory settings. At
the moment the default settings are pretty generous with regards to
memory.
In other words, you can do it simply by running
gradle build -Dorg.gradle.java.home=<java home path>
Depending on what you want to accomplish, one of the following should work.
As Amnon Shochot suggested, set the -Dorg.gradle.java.home flag. This is probably preferable in most cases.
If you want to have use a particular JDK throughout, set the JAVA_HOME variable appropriately before executing gradle.
$ export JAVA_HOME=/usr/local/specialJava/
$ gradle build
If you don't want to change the environment, try adding the below to your build.gradle script. It should affect only the compiler used to compile Java code, nothing else. So Gradle doesn't run inside this particular JDK, but it will use it for compiling.
tasks.withType(JavaCompile) {
options.fork = true
options.forkOptions.executable = "/usr/local/specialJava/bin/javac"
}
(Last option stolen from here)
My work project needs to be compiled and run under JDK1.5 and I'm on a Mac. I followed the instructions here to get 1.5 back on Snow Leopard, and it works fine when building from IntelliJ IDEA, or if I'm just in the same directory as the build.xml and try "ant CleanRebuild" When I "Run Target" in NetBeans they're all compiled with the wrong version resulting in
java.lang.UnsupportedClassVersionError:
Bad version number in .class file
(unable to load class...
when tomcat is trying to start up.
So things I've tried
Set the "Java Platform" to 1.5 under the project properties/libraries.
Set the Source/Binary Format to JDK 5 under project properties/sources.
Pointed the ant home to the ant I'm using under preferences/ant
Renaming every javac executable I could find in the hopes NetBeans would fail to compile and I could figure out which one it was using (no luck)
Setting 1.5 as the default, resulting in the need to point $netbeans_jdkhome to the 1.6 jdk in order for NetBeans to even start.
All unsuccessful....
Again, if I cd into the directory of the netbeans project with the build.xml and run the command manually all is well....so NetBeans. What's the deal?
Revised answer
Assumptions: NetBeans version 6.9.1 (although likely applicable to most or all 6.x versions), alternative build systems (e.g., Maven) are not used...the default (Ant) is used.
NetBeans, by default, uses Ant as its build system for doing things like compiling a project, building a project, cleaning built files from a project, etc. Ant has two concepts that are applicable here: targets and tasks. A target, in Ant's vocabulary, is simply a "command" or a series of jobs that need to be completed for a particular job. In NetBeans, common targets are "Compile", "Build", "Clean and Build", etc. The "jobs" that a target completes are (among other things) Ant tasks. In NetBeans one task (which is particularly relevant in answering this question) is the Javac Task. This is the task that Ant uses to compile .java files into .class files.
An Ant-based project, and therefore a NetBeans project, uses the file build.xml to control the build process and tell Ant how to go about accomplishing the targets. In a NetBeans project, the build.xml is found in the root directory of the project, by default. NetBeans, however, uses a user-extensible build.xml file. The core targets and tasks defined by NetBeans are actually located in nbprojects/build-impl.xml and imported into build.xml within the first few lines of the file. The theory is that users can add or override things in build.xml while the core NetBeans-defined configuration remains untouched in the build-impl.xml file.
If you look in the default nbproject/build-impl.xml file for a NetBeans Java project, you will find the Javac task referred to twice. (Search for "<javac".) Both are in macro definitions, and therefore deep within the complexities of NetBean's default build configuration. If we refer to the Javac Task documentation we find that the tasks uses the compiler in the location specified either by the global build.compiler property, by the compiler attribute specified with the <javac... /> task, or the default which is the Java compiler that is used when running and, and thus the one that is used when running NetBeans (because it is what fires off the Ant process). Since we don't see build.compiler or the compiler attribute anywhere (in the default build-impl.xml), then we can only conclude that the default is being used.
So here we have the (more-or-less correct) first answer. NetBeans compiles using the JDK that was used to execute NetBeans by default. It looks like it is actually a bit more complicated than that simple answer, but it is essentially correct. If you look at the documentation for the Javac Task it alludes to "a class that implements the CompilerAdapter interface", which suggests that rather than calling the javac executable directly, Ant (and therefore NetBeans) compiles using the compiler class (that, in all likelihood, the javac executable also uses). Refer to the Original answer below to determine which JDK what used to run NetBeans.
So, what if you don't want to use the default JDK that was used to run NetBeans? This is where "Java Platforms" comes in. Go to the Tools menu, and click on "Java Platforms". You likely only have one platform defined here. (As an aside, this is actually the most correct answer to what JDK is used by default... the one defined here in the Java Platform Manager.) If you would like to compile against another Java version (say your default JDK is 1.6, but you want to compile against 1.5) then you would install the alternate JDK somewhere on your system, and then configure a platform here in NetBeans' Java Platform Manager. (I'll leave it as an exercise for you to find the documentation on how to add a Java Platform. A superficial search of the wiki didn't turn up anything obvious. In any case, it's fairly self-explanatory.)
Once a new platform is created in the manager, you would right-click on your project in the Projects tab, click on "Properties", and then on "Libraries". At the top, you would select the appropriate Java platform for the project. As soon as you change this value and click on "OK", NetBeans makes several adjustments to your build-impl.xml file that point it to the new JDK against which to compile. (It is instructive for the truly geeky amongst us to make a copy of the nbproject directory before making this change and to diff that against the new contents of the nbproject directory after the change is made.) The changes instruct the Javac Ant Task to use the (equivalent of the) javac executable of the specified platform. So here we have the most correct answer: NetBeans uses the equivalent of the javac executable (as invoked by the Ant javac task) that is specified in the project's Java Platform located under the Libraries node of the project's properties.
Original answer
The path to the JDK used by NetBeans can be found in the netbeans.conf file. Look for the netbeans_jdkhome entry.
You can also specify the jdkhome at runtime (*NIX example given):
netbeans --jdkhome /usr/bin/jdk1.6.0_22
The netbeans.conf file is found in different places depending on what OS you are using. See the NetBeans.conf FAQ on the NetBeans wiki for help finding the file.
A few additional comments...
...You can specify the -target option in the project properties. In NetBeans 6.9 right-click on the project, and choose Properties. Click on the Compiling node. Add your -target to Additional Compiler Options.
...I have read in a few places that specifying a target is not a guarantee that the code will run on a JRE whose version is lower than the JDK that built it. In other words, the recommendation seems to be that if you want 1.5 binaries, then compile with the 1.5 JDK.
I have just set up Hudson on my server. For some reason, my build will not call javac to compile my builds...? I have set the path to the JDK in the Manage Hudson area, and it seems to recognise it (doesn't give me a warning). Is there something else I'm supposed to do?
Here's a sample console output of one of my jobs (note how javac isn't called at all):
Started by user admin
Checking out
svn+ssh://myhost.com/Project1
A /src/Program.java
A build.xml
U
At revision 119
no change for
svn+ssh://myhost.com/Project1 since
the previous build
Finished: SUCCESS
You need to set the ant-target for your build.
Since this is a netbeans project you should have ant target like: compile, default etc?
One or more of these build target must be set in your job on hudson under the configuration menu. I think the field is called "Targets"
Some information on configuring ant in hudson: http://testinfected.blogspot.com/2009/01/hudson-default-anth.html