找不到tools.jar React Native Android在Windows 10中

Question

guys . i just try to install react native in my laptop. i've followed all setup instruction but i stiil get those error .

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Could not find tools.jar

i used genymotion with os version 5.1.0, i've setup environment variable for android_home. Any idea what i miss here ?

Answer 1

Setting the missing "JAVA_HOME" system environment variable worked for me.

• Press WIN+Pause on keyboard.
• Click advanced system settings.
• Click "Environment variables".
• Click "New" under "System variables".
• Type "JAVA_HOME" in the Variable name field.
• Type the path to the JDK in the Value field. For me the correct path with short filename was "C:\\PROGRA~1\\Java\\jdk1.8.0_66". Your path will vary depending on the installed version.
• Click OK, and OK in previous window too.
• Restart any command prompts or restart the computer.
• react-native run-android worked fine after that.

Answer 2

Setting up appropriate JDK (not JRE. JRE does not have tools.jar ) version (Eg JDK 1.7x) path as the JAVA_HOME would resolve this issue.

Please check your computer's environment variables and set JAVA_HOME if it has not already been setup.

Answer 3

I'm gonna go on a long shot here. There is a tools.jar in java libs folder.[the java sdk that is]

Usually all these frameworks and ides have a lib folder themselves. and it is missing said tools.jar. Just copy paste it there.

Answer 4

I had the same problem while running react-native run-android it gave me the error tool.jar not found. i solved this by adding a single line mentioned below, in gradle.properties file which is in android project. org.gradle.java.home=C:\\Program Files\\Java\\jdk1.8.0_121

Answer 5

If you have the Android Studio embedded JDK, then it may cause conflicts. A workaround for this problem I've found is setting your JAVA_HOME to the default JDK location specified in Android Studio.

1. Open Android Studio
2. Press Ctrl + Alt + Shift + S to open Project Structure window.
3. Set your JAVA_HOME environment variable to the path specified under "JDK location".

Answer 6

If this problem occurs for Windows, then the solution here is fairly simple.

Install Chocolatey

• Follow the installation instructions on this page. https://chocolatey.org/install

Install jdk8

Restart Command Prompt or Powershell as Administrator, and run:

choco install jdk8

Now if you run

react-native run-android

This error shouldn't show up.

Answer 7

Just to add another data point for people pulling their hair out. I think a java update may have messed up my environment that was working fine 2 months ago. The combination of what worked for me:

Set JAVA_HOME to 1.7 , NOT 1.8 .

I had 2 1.8 versions installed and neither worked.

Answer 8

Find and copy tool.jar from JDK path C:\\Program Files\\Java\\jdk1.8.0_151\\lib\\tool.jar

then paste it in JRE folder C:\\Program Files\\Java\\jre1.8.0_181\\lib

then delete build folder from your project/android/app/=>build

and then try react-native run-android

Answer 9

我知道这个问题适用于Windows，但这是Google上出现此错误的第一个结果，因此对于Linux，此问题可以通过以下方式解决：

sudo apt install default-jdk

Answer 10

I have deleted " \\react_native_project_path\\android " directory and run

    reactive-native android

then run ..

    reactive-native run-android

Then the error is gone