Android 5.0 build errors with Java version issue

Question

My current java version running on my Ubuntu 14.04 is

java -version
java version "1.7.0_72"
Java(TM) SE Runtime Environment (build 1.7.0_72-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode)

I've typed the command to change the java version

sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
  ------------------------------------------------------------
  0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      auto mode
* 1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode
  2            /usr/lib/jvm/java-7-oracle/jre/bin/java          1         manual mode

Press enter to keep the current choice[*], or type selection number: 1
test@test-ZX-530:/media/test/SSD/N7$ sudo update-alternatives --config javac
There are 2 choices for the alternative javac (providing /usr/bin/javac).

  Selection    Path                                         Priority   Status
  ------------------------------------------------------------
  0            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   1071      auto mode
* 1            /usr/lib/jvm/java-7-openjdk-amd64/bin/javac   1071      manual mode
  2            /usr/lib/jvm/java-7-oracle/bin/javac          1         manual mode

Press enter to keep the current choice[*], or type selection number: 1

After configuring this, the java -version does not change.

When I tried to build Android 5.0, the error occured and shown the following error message:

============================================
Checking build tools versions...
************************************************************
You asked for an OpenJDK 7 build but your version is
java version "1.7.0_72" Java(TM) SE Runtime Environment (build 1.7.0_72-b14) Java     HotSpot(TM) 64-Bit Server VM (build 24.72-b04, mixed mode).
************************************************************
build/core/main.mk:191: *** stop. Stop.

#### make failed to build some targets  ####

Any idea to this? Thanks!

==================================================================================

I have found out the question to this issue.

The java version is Openjdk when I run

. build/envsetup.sh

However, when I run

lunch aosp_flo-userdebug

The java version switch back to Java SE.

Please let me know if you may have any idea

Thanks

===========================================================================

Hi,

lunch aosp_flo-userdebug

I thihk this command checks my configuration and switches back to Java SE jdk version.

After running this command and exporting my OpenJDK path again make the build work.

Answer 1

Building Kitkat needs Sun/Oracle JDK 6 version, and building Lollipop needs OpenJDK 7. Currently, I have both projects on my Ubuntu. I use a script to switch the JDK version, and it works.

Put the jdk_switch.sh in my ~ directory and run the following commands to switch jdk version:

$ . ./jdk_switch.sh jdk7
$ . ./jdk_switch.sh jdk6

The path of JDK are:

/usr/lib/jvm/java-6-oracle/
/usr/lib/jvm/java-7-openjdk-amd64/

The content of jdk_switch.sh:

#!/bin/bash
case $1 in
    jdk6)
 export JAVA_HOME=/usr/lib/jvm/java-6-oracle/
 ;;
    jdk7)
 export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
 ;;
    *)
 export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64/
 ;;
esac

export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/lib

java -version

---

OpenJDK 7 version is :

java -version
java version "1.7.0_65"
OpenJDK Runtime Environment (IcedTea 2.5.3) (7u71-2.5.3-0ubuntu0.12.04.1)
OpenJDK 64-Bit Server VM (build 24.65-b04, mixed mode)

In your case, exporting your PATH and CLASSPATH might helpful. Or just use a simple bash script. I hope this might help you.