Gradle does not find tools.jar

Question

I am using javadoc doclets with gradle, so I need to use the package tools.jar, which is in the lib folder from the jdk (1.6.0_26 in my case).

The point is that gradle does not take it automatically, so I was adding that tools package to my libs folder, and then adding it to dependencies.gradle .

Now I want to take it directly from my JDK home into my dependencies.gradle. Is there a way to do that? I have tried the next in my dependencies.gradle:

compile files("${System.properties['java.home']}/lib/tools.jar")

But it does not find it while compiling.

It is worth mentioning that, as pre-cursor to solving this and as I ran into when I was getting this, you'll need to make sure you've actually got a JDK installed :P And, on some systems, you'll need to install the devel JDK package to get tools.jar — mrooney, Jul 21 '16 at 16:57

score 162 · Answer 1 · answered Feb 25 '16 at 09:25

162

I had this problem when I was trying to run commands through CLI.

It was a problem with system looking at the JRE folder i.e. D:\Program Files\Java\jre8\bin. If we look in there, there is no Tools.jar, hence the error.

You need to find where the JDK is, in my case: D:\Program Files\Java\jdk1.8.0_11, and if you look in the lib directory, you will see Tools.jar.

What I did I created a new environment variable JAVA_HOME:

And then you need to edit your PATH variable to include JAVA_HOME, i.e. %JAVA_HOME%/bin;

Re-open command prompt and should run.

answered Feb 25 '16 at 09:25

benscabbia

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the tool.jar is in `%JAVA_HOME%\lib;` not in `bin` folder. – Sam YC Jun 02 '16 at 09:58
5

does this mean that we should be adding both `%JAVA_HOME%/bin` and `%JAVA_HOME%/lib` to the `Path` variable then? – Eric Sep 27 '16 at 03:12
3

Even though tools.jar is indeed in \lib, adding only \bin to path as in solution worked for me but don't ask why. – PHPirate May 19 '17 at 16:09
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Usually a restart/logout is required for changes to have an effect. – reiner_zuphall Oct 10 '17 at 09:01
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I had to remove the PATH entry C:\ProgramData\Oracle\Java\javapath and replace it with C:\ProgramData\Oracle\Java\jdk1.8.xxx it was defaulting to the sister JRE directory – John May 02 '18 at 19:51

score 81 · Accepted Answer · answered Jul 05 '12 at 13:47

81

Found it. System property 'java.home' is not JAVA_HOME environment variable. JAVA_HOME points to the JDK, while java.home points to the JRE. See that page for more info.

Soo... My problem was that my startpoint was the jre folder (C:\jdk1.6.0_26\jre) and not the jdk folder (C:\jdk1.6.0_26) as I thought(tools.jar is on the C:\jdk1.6.0_26\lib folder ). The compile line in dependencies.gradle should be:

compile files("${System.properties['java.home']}/../lib/tools.jar")

answered Jul 05 '12 at 13:47

raspayu

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so, how to set java.home in idea with gradle ? – Chinaxing Oct 10 '14 at 05:46
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Any help for mac users? – Surya prakash chaturvedi Nov 16 '20 at 12:15

score 74 · Answer 3 · answered Aug 19 '16 at 13:21

74

I got the same error using Eclipse trying to execute a Gradle Task. Every time I run a command (i.e. war) the process threw an exception like:

Could not find tools.jar. Please check that C:\Program Files\Java\Jre8" is a valid JDK install.

I tried the solution listed in this post but none of them solved this issue. Here my solution :

Go to the "Gradle Task" view
Right Click on the task you want to execute
Select Open Gradle Run Configuration
In the tab "Java Home" select your local JDK repository then click OK

Run again, Enjoy!

answered Aug 19 '16 at 13:21

rattek

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I've found this answer after hours of searching, and this finally worked. Thank you so much! – Martin Häusler Feb 22 '17 at 14:39
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I cant find Open Gradle Run and Java Home. Can you explain further? – May 17 '17 at 19:53
Being new to this, how would one "Go to the "Gradle Task" view"? I don't see anything Gradle under the View menu, nor anything labeled anything like that? – Dronz Oct 23 '18 at 05:56

score 62 · Answer 4 · answered Jun 29 '16 at 12:30

62

I just added a gradle.properties file with the following content:

org.gradle.java.home=C:\\Program Files\\Java\\jdk1.8.0_45

answered Jun 29 '16 at 12:30

bondehagen

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On linux, you can also edit `~/.gradle/gradle.properties` file, adding `org.gradle.java.home=/usr/lib/jvm/java`. Works for me on Fedora 24. – samsong8610 Jul 27 '16 at 07:52

Italo Borssatto · Answer 5 · 2018-01-17T23:51:29.173

44

I had a similar case using Ubuntu. The machine had only the JRE installed. So, I just executed the command below to install the JDK.

sudo apt install openjdk-8-jdk

edited Jan 17 '18 at 23:51

answered Jul 27 '17 at 15:47

Italo Borssatto

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Yes, installing JDK instead of JRE also solved the problem for me. – peschü Jan 16 '18 at 08:37
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I was getting the same issue even though i had java installed and i saw a folder for openjdk. Later only i realized that the folder had only JRE installed. Not JDK. – Ajith M A Aug 31 '21 at 06:57
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So I had the jdk installed, my JAVA_HOME set -- I ran this exact command and verified with `java -version` (Debian). Then after seeing this comment, for kicks I re-ran it, and then my build worked fine. I'm not sure what happened, it must have missed some packages on the initial install. Thank you though! – orpheus Feb 16 '22 at 16:34

Future2020 · Answer 6 · 2021-08-01T20:20:39.490

In macOS Big Sur

The issue happens because of the environment variable JAVA_HOME is not correctly set in macOS Big Sur.

Step 1 - Confirm that you have issue with JAVA_HOME by printing its value in the terminal. You will most likely get an empty string.

echo $JAVA_HOME

Step 2 - Find the correct path on your machine

/usr/libexec/java_home -V

Copy that path associated with "Java SE 8" which usually looks like /Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home

Step 3 - Edit .zshenv using nano

nano ~/.zshenv

Step 4 - Add the path from step 2 to the file as follows

export JAVA_HOME=YOUR_JAVA_PATH

example:

export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_202.jdk/Contents/Home

Step 5 - Source the updated .zshenv file to activate the environment variable

source ~/.zshenv

Step 6 - Print to confirm the path

echo $JAVA_HOME

These 6 steps WORKED! after 3 days of nada -> r3 Corda docs & various tutorials say to modify `~/.zshrc` which does not work on my Mac. — ehounder, Aug 29 '22 at 01:04

score 27 · Answer 7 · answered Mar 11 '16 at 11:44

27

I was struggling as well for this Solution. Found a better way to it with Gradle as described here. We can get the JVM/JDK information from Gradle itself.

dependencies {
   runtime files(org.gradle.internal.jvm.Jvm.current().toolsJar)
}

So simple.

answered Mar 11 '16 at 11:44

Mohammed

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This works for me if I use `compile` instead of `runtime` – Dori Aug 18 '16 at 09:21
I like this solution. It's nice and portable. – Adam Plumb Jun 12 '17 at 19:47
7

This solution does not work with Gradle 4.x. I get a `NullPointerException`. – Thunderforge Jun 06 '18 at 23:25
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I can imagine it returning null when there is no tools.jar available with latest JDK. See https://github.com/gradle/gradle/blob/master/subprojects/base-services/src/main/java/org/gradle/internal/jvm/Jvm.java#L297 – Mohammed Sep 23 '19 at 12:48

score 22 · Answer 8 · answered Mar 19 '18 at 21:19

22

In CentOS7 the development package will install tools.jar. The file is not present in java-1.8.0-openjdk

sudo yum install java-1.8.0-openjdk-devel

answered Mar 19 '18 at 21:19

Richard Ginsberg

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Thanks Richard! It really helped me! I was struggling running "react-native run-android" and getting the error: * What went wrong: Execution failed for task ':app:compileDebugJavaWithJavac'. > Could not find tools.jar. Please check that /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-5.b14.fc27.x86_64/jre contains a valid JDK installation. Now it's working! Thanks again! – Matheus Gontijo Mar 22 '18 at 20:19
Thanks Richard..It worked for me as well. Basically it was a JAVA_HOME path issue which tried to find tools.jar in the desired java jdk path. – rajdeepbs29 Nov 27 '18 at 14:55
I am using Amazon Linux AMI and this solution worked perfectly. – Freddie Oct 23 '20 at 20:10

azizbekian · Answer 9 · 2017-11-17T11:06:39.833

19

Add this to gradle.properties:

org.gradle.java.home=C:\Program Files\Java\jdk1.8.0_91

edited Nov 17 '17 at 11:06

answered Aug 08 '16 at 09:25

azizbekian

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Don't forget to use double back slashes. For example: `org.gradle.java.home=C:\\Program Files\\Java\\jdk1.8.0_144\ `. – CoolMind Apr 03 '18 at 10:27

score 13 · Answer 10 · answered Dec 08 '20 at 06:17

My solution on Mac:

add this line to gradle.properties:

org.gradle.java.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_271.jdk/Contents/Home

not this one:

org.gradle.java.home=/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

you can open the last home directory and will find that there is no lib/tools.jar file existence, so change the path to JavaVirtualMachines/jdk1.8.0_271.jdk and it works for me.

By the way, in the terminal, I echo the $JAVA_HOME and it gets the first path, not the second one, I think this is why my Gradle cannot work properly.

Thanks! Adding the $JAVA_HOME environment to my `.zshrc` and adding it to `gradle.properties` did it for me :D — CodeSammich, Dec 16 '20 at 02:26

score 12 · Answer 11 · answered Aug 16 '18 at 14:46

With Centos 7, I have found that only JDK has tools.jar, while JRE has not. I have installed the Java 8 JRE(yum install java-1.8.0-openjdk), but not the JDK(yum install java-1.8.0-openjdk-devel).

Installing the latter solves the problem. Also, remember to set JAVA_HOME.

score 11 · Answer 12 · edited May 23 '17 at 12:02

11

It may be two years too late, but I ran into the same problem recently and this is the solution I ended up with after finding this post:

import javax.tools.ToolProvider

dependencies {
  compile (
    files(((URLClassLoader) ToolProvider.getSystemToolClassLoader()).getURLs()),
    ...
  }
}

It should work if java.home points to a directory that's not under the JDK directory and even on Mac OS where you'd have classes.jar instead of tools.jar.

edited May 23 '17 at 12:02

Community

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answered Mar 02 '15 at 08:31

Andrei LED

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Cannot invoke method getURLs() on null object – Ulterior Jan 30 '20 at 06:11

Duncan O. N. · Answer 13 · 2018-02-19T13:30:45.967

10

On windows 10, I encounter the same problem and this how I fixed the issue;

Access Advance System Settings>Environment Variables>System Variables
Select PATH overwrite the default C:\ProgramData\Oracle\Java\javapath
With your own jdk installation that is JAVA_HOME=C:\Program Files\Java\jdk1.8.0_162

edited Feb 19 '18 at 13:30

answered Feb 13 '18 at 17:56

Duncan O. N.

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this should be the accepted answer for Windows :) --thanks – Saher Ahwal Mar 26 '20 at 21:47

score 9 · Answer 14 · answered May 22 '18 at 10:04

9

On my system (Win 10, JRE 1.8.0, Android Studio 3.1.2, Gradle 4.1) there is no tools.jar in the JRE directory (C:\Program Files\Java\jre1.8.0_171).

However, I found it in C:\Program Files\Android\Android Studio\jre\lib and tried setting JAVA_HOME=C:\Program Files\Android\Android Studio\jre

That works (for me)!

answered May 22 '18 at 10:04

Stefan Densow

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Same issue, fixed it for me, also Win 10/Android Studio. Also, none of the above solutions actually seems to download a "Tools.jar" ... just doesn't come with the jre) – Erik Aronesty Oct 29 '18 at 21:30
Worked for me too. I created a gradle.properties in the project root containing `org.gradle.java.home=E:\\Android Studio\\jre` – br4nnigan Dec 02 '19 at 19:30

score 5 · Answer 15 · edited Nov 02 '20 at 11:44

5

What solved it for me was the following:

found tools.jar in C:\Program Files\Android\Android Studio\jre\lib
copy paste to C:\Program Files (x86)\Java\jre1.8.0_271\lib
ran the code again and it worked.

edited Nov 02 '20 at 11:44

4b0

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answered Nov 02 '20 at 11:36

B. Robert

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Hi there! Thanks for the answer :) I am sure that worked.... However, please check the other answers in this question. It will help you in the future to understand the differences between the Java Runtime Environment (JRE) and the Java Development Kit (JDK). – raspayu Nov 02 '20 at 13:34
It works for me!! So this comment helps me to solve my problem as well. Thanks bro! – Jesus Erwin Suarez Feb 11 '22 at 15:02

score 4 · Answer 16 · answered Jun 21 '18 at 12:21

4

If you use terminal to build and you have this error you can point to jdk bundled with android studio in your gradle.properties file:

org.gradle.java.home=/usr/local/android-studio/jre

answered Jun 21 '18 at 12:21

Wiktor Wardzichowski

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score 3 · Answer 17 · answered Nov 13 '17 at 11:35

Linux

Open /etc/environment in any text editor like nano or gedit and add the following line:

JAVA_HOME="/usr/lib/jvm/open-jdk"

Windows

Start the System Control Panel applet (Start - Settings - Control Panel - System).
Select the Advanced tab.
Click the Environment Variables button.
Under System Variables, click add button, then past the following lines:

in Variable Name : JAVA_HOME

in Variable Value : C:\Program Files\Java\jdk1.x.x_xxx

where x.x_xxx jdk version you can get your jdk version from here C:\Program Files\Java
Under System Variables, select Path, then click Edit,then click new button then past the following line:

%JAVA_HOME%/bin;

Paths may vary slightly. In Fedora this worked for me with `JAVA_HOME="/usr/lib/jvm/java-openjdk"` — rvf, Dec 14 '18 at 15:00

live-love · Answer 18 · 2018-01-07T03:03:13.840

This worked for me:

I was getting message

Execution failed for task ':app:compileDebugJavaWithJavac'.

Could not find tools.jar. Please check that C:\Program Files\Java\jre1.8.0_121 contains a valid JDK installation.

In Android Studio, check your SDK Location.
File, Project Structure, SDK Location, JDK Location.
Example: C:\android-studio\android-studio\jre
Copy the tools.jar file in the C:\android-studio\android-studio\jre\lib folder into the C:\Program Files\Java\jre1.8.0_121\lib folder.
Retry.

score 2 · Answer 19 · answered Sep 10 '16 at 04:48

Like other answers I set org.gradle.java.home property in gradle.properties file. But path with \ separators did not work (building on windows 10):

Java home supplied via 'org.gradle.java.home' is invalid. Invalid directory: C:Program FilesJavajdk1.8.0_65

So instead of

org.gradle.java.home=C:\Program Files\Java\jdk1.8.0_65

i had to use

org.gradle.java.home=C:/Program Files/Java/jdk1.8.0_65

then the build was successful

Problem is that project is build with JRE instead of JDK and since I was building it from eclipse this also worked:

In Window>Preferences>Gradle>Arguments specify Workspace JRE and specify your JDK.
In Window>Preferences>Java>InstalledJREs specify your JDK as default

score 2 · Answer 20 · answered Apr 25 '17 at 14:19

2

In my case (Windows 10) after Java update I lost my Enviroment Variables, so I fixed added the variables again, based in the following steps https://confluence.atlassian.com/doc/setting-the-java_home-variable-in-windows-8895.html

answered Apr 25 '17 at 14:19

Ciro Mine

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score 2 · Answer 21 · answered Mar 13 '19 at 17:17

2

I solved problem on this way:

download file tools-1.8.0.jar on http://www.java2s.com/Code/Jar/t/Downloadtools180jar.htm
unzip file and rename to tools.jar
copy to C:\Program Files\Java\jre1.8.0_191\lib folder
Retry

answered Mar 13 '19 at 17:17

Veljko P.

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Had to copy it to `C:\Program Files (x86)\Java\jre1.8.0_211` and `C:\Program Files (x86)\Java\jre1.8.0_251` – TessavWalstijn Apr 15 '20 at 12:07

score 2 · Answer 22 · answered Oct 17 '20 at 09:50

2

Put in gradle.properties file the following code line:

org.gradle.java.home=C:\\Program Files\\Java\\jdk1.8.0_45

Example image

answered Oct 17 '20 at 09:50

Adário Muatelembe

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Greg Allen · Answer 23 · 2022-08-11T13:37:13.393

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Use this with modern versions of gradle:

def compiler = javaToolchains.compilerFor { languageVersion = JavaLanguageVersion.of(java.sourceCompatibility.majorVersion) }.get()
implementation compiler.metadata.installationPath.files('lib/tools.jar')

edited Aug 11 '22 at 13:37

answered Apr 07 '22 at 11:12

Greg Allen

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the most elegant answer inspired as I understand by official Gradle documentation (https://docs.gradle.org/current/userguide/toolchains.html) – Cool Soft Aug 02 '22 at 10:26
now amended so that the language version need not be hard-coded – Greg Allen Aug 11 '22 at 13:37
NB. this is not used for Java 17 - there is no tools.jar any more.. – Greg Allen Sep 22 '22 at 08:00

score 1 · Answer 24 · answered Jul 05 '12 at 13:34

1

Did you make sure that tools.jar made it on the compile class path? Maybe the path is incorrect.

task debug << {
    configurations.compile.each { println it }
}

answered Jul 05 '12 at 13:34

Peter Niederwieser

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Yes it did made it to class path, but still getting the issue. – Abhishek Gupta Sep 04 '16 at 15:57

score 1 · Answer 25 · edited Dec 18 '17 at 04:46

1

Adding JDK path through JAVA_HOME tab in "Open Gradle Run Configuration" will solve the problem.

edited Dec 18 '17 at 04:46

Robert Columbia

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answered Dec 18 '17 at 03:35

Haseena B

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yoAlex5 · Answer 26 · 2021-04-16T11:03:48.420

1

Could not find tools.jar

MacOS

echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile

And restart Shell

edited Apr 16 '21 at 11:03

answered Apr 16 '21 at 10:23

yoAlex5

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score 0 · Answer 27 · answered Feb 22 '19 at 18:17

I've tried most of the top options but it seems that I had something wrong with my environment setup so they didn't help. What solved the issue for me was to re-install jdk1.8.0_201 and jre1.8.0_201 and this solved the error for me. Hope that helps someone.

score 0 · Answer 28 · answered Jan 17 '21 at 13:28

For me this error ocurred after trying to use audioplayers flutter library. To solve i got tools.jar of the folder:

C:\Program Files\Android\Android Studio\jre\lib

and pasted on

C:\Program Files\Java\jre1.8.0_181\lib.

After this the build worked fine.

score 0 · Answer 29 · answered Jun 19 '21 at 12:56

My Android Studio Version: 4.2.1

The "tools.jar" is provided by Oracle JDK which is required by android studio for compilation - I have faced this issue after updating android studio to latest version in my PC.

To Resolve the issue follow below steps:

In Android studio File -> Project Structure -> SDKs (Under Platform Settings)

A) Add JDK path by pressing '+' symbol in middle pane if suppose JDK/JDK home path is not present in the middle pane already (Middle pane also contains the Downloaded Android SDK's)

B) Java sdk will be usually present/installed in the path 64 bit => "C:\Program Files\Java\jdk1.X.Y_ABC" (In my PC it is 1.8.0_202) or 32 bit => "C:\Program Files (x86)\Java\jdk1.X.Y_ABC"
If suppose you don't have JDK installed in your PC, please download and install from Oracle Java website https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

Set JDK and JRE Path(Download both from webpage mentioned in step 2) in system environment variable

A) Press windows key type "Edit the system environment variables" and open the application

B) Go to Advanced -> Environment Variables Under system variables add JAVA_HOME and JRE_HOME as below

Set Windows system environment variable

Add jdk lib path on the Path environment variable under user variables (this step is required only if the error not resolves with the previous steps) C:\Program Files\Java\jdk1.X.Y_ABC\lib

score 0 · Answer 30 · answered Aug 15 '21 at 13:25

0

For Windows add JDK home path to the Gradle property file as org.gradle.java.home. If you don't have gradle.properties file then create a new one and add

Ex: org.gradle.java.home=C:\Program Files\Java\jdk1.8.0_241

answered Aug 15 '21 at 13:25

Chamiz

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score 0 · Answer 31 · answered Jun 29 '23 at 16:11

0

In Case, Non of the above solutions work. Simply copy tools.jar file from jdk folder into the jre folder. Make sure you have elevated privileges before you make this move.

answered Jun 29 '23 at 16:11

Jaskirat Singh Takhar

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Gradle does not find tools.jar

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