Hi! Here is a  solution for the “could not find jdk tools.jar” while executing “make” command to build android source code, caused by wrong java version used on PC.

Error:

build/core/config.mk:601: *** Error: could not find jdk tools.jar at /usr/lib/jvm/java-11-openjdk-amd64/bin/../lib/tools.jar, please check if your JDK was installed correctly.  Stop.

Cause: tools.jar is not available in latest openjdk versions (after openjdk-9). I had openjdk-11 on my machine.

Solution:

Step 1:  Install Openjdk-8 or 9

sudo apt-get install openjdk-8-jdk

Install OpenJDK-9

• Download openjdk-9 from archive: https://jdk.java.net/archive/
• Unzip using command

tar -xzf '/home/OpenJDK/openjdk-9_linux-x64_bin.tar.gz'

• Use following commands

cd jdk-9

update-alternatives --install /usr/bin/java java /home/OpenJDK/jdk-9/bin/java 100

Step 2: Set Openjdk-8 as default java version.

sudo update-alternatives --display java
sudo update-alternatives --config java
java -version

Cheers !