Develop Reference

AOSP: Can't Run Emulator

I'm an AOSP newbie. I am following this tutorial.
I have successfully synced my repo to tag android-11.0.0_r29.
I set lunch to aosp_arm-eng (I've also tried aosp_x86_64-eng). The build reports:
...
[ 99% 90444/90520] //art/build/apex:art-check-debug-apex-gen generate art-check-debug-apex-gen.dummy
--bitness=auto, trying to autodetect. This may be incorrect!
Detected multilib
[100% 90520/90520] Target vbmeta image: out/target/product/generic_arm64/vbmeta.img
#### build completed successfully (05:25:57 (hh:mm:ss)) ####
However, when I attempt to run the emulator:
clayton#ubuntu-20-aosp:~/aosp$ emulator
emulator: ERROR: Can't get kernel version from the kernel image file: '/home/clayton/aosp/prebuilts/qemu-kernel/arm64/ranchu/kernel-qemu'
Have not found a solution. Please help.

I use lunch sdk_phone_x86_64-userdebug, and it works fine with Android 11 on my x86 architecture laptop.

Building AOSP with only 8 GB RAM

I encounted the following trouble when building the AOSP 7.
[ 45% 16221/35670] Building with Jack:...k_intermediates/with-local/classes.dex
FAILED: /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex.rsp
Out of memory error (version 1.2-rc4 'Carnac' (298900 f95d7bdecfceb327f9d201a1348397ed8a843843 by android-jack-team#google.com)).
GC overhead limit exceeded.
Try increasing heap size with java option '-Xmx'.
Warning: This may have produced partial or corrupted output.
[ 45% 16221/35670] Building with Jack:...colorpicker_intermediates/classes.jack
ninja: build stopped: subcommand failed.
build/core/ninja.mk:148: recipe for target 'ninja_wrapper' failed
make: *** [ninja_wrapper] Error 1
#### make failed to build some targets (01:26:54 (hh:mm:ss)) ####
Is this because AOSP became bigger in capacity?
I have never faced such trouble when I tried to build AOSP 6 or lower versions.
Please help.

You need to edit .jack-settings, and add this line
JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m"
Hope this solves your problem.

Android source code compile error: "Try increasing heap size with java option '-Xmx<size>'"

Error happens when I try to compile Android source code(Sourcecode-version: 6.0.1; RAM: 6G; host system: ubuntu 14.04),log is below:
including ./system/netd/Android.mk ...
including ./system/security/keystore-engine/Android.mk ...
including ./system/security/keystore/Android.mk ...
including ./system/security/softkeymaster/Android.mk ...
including ./system/tools/aidl/Android.mk ...
including ./system/update_engine/Android.mk ...
including ./system/vold/Android.mk ...
including ./system/weaved/Android.mk ...
including ./system/webservd/Android.mk ...
including ./tools/external/fat32lib/Android.mk ...
Starting build with ninja
ninja: Entering directory `.'
[ 0% 1/21275] Ensure Jack server is installed and started
Jack server already installed in "/home/eddy/.jack-server"
Launching Jack server java -Djava.io.tmpdir=/tmp -Dfile.encoding=UTF-8 -XX:+TieredCompilation -cp /home/eddy/.jack-server/launcher.jar com.android.jack.launcher.ServerLauncher
[ 0% 17/21275] host Java: conscrypt-host (out/host/common/obj/JAVA_LIBRARIES/conscrypt-host_intermediates/classes)
warning: [options] bootstrap class path not set in conjunction with -source 1.7
external/conscrypt/src/openjdk/java/org/conscrypt/Platform.java:39: warning: AlgorithmId is internal proprietary API and may be removed in a future release
import sun.security.x509.AlgorithmId;
^
external/conscrypt/src/openjdk/java/org/conscrypt/Platform.java:243: warning: AlgorithmId is internal proprietary API and may be removed in a future release
return AlgorithmId.get(oid).getName();
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
3 warnings
[ 0% 18/21275] host Java: signapk (out/host/common/obj/JAVA_LIBRARIES/signapk_intermediates/classes)
warning: [options] bootstrap class path not set in conjunction with -source 1.7
1 warning
[ 0% 73/21275] Building with Jack: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex
FAILED: /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex.rsp
GC overhead limit exceeded
Try increasing heap size with java option '-Xmx<size>'
Warning: This may have produced partial or corrupted output.
ninja: build stopped: subcommand failed.
make: *** [ninja_wrapper] Error 1
#### make failed to build some targets (14:09 (mm:ss)) ####
eddy#eddy-OptiPlex-390:~/WORKING_DIRECTORY$
Anyone can tell me why the compiling failed?

I had the same problem. So I've tried to set JACK_SERVER_VM_ARGUMENTS to include -Xmx=4g, but when building again the log output showed that this was not included in the startup. I don't know why, it seems like the env vars do not get passed to the build script correctly.
Solution
Before starting a clean android build set the JACK_SERVER_VM_ARGUMENTS to include -Xmx=4g, then stop and start the jack server manually. Given you're in the main source tree of AOSP run the following:
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4g"
./prebuilts/sdk/tools/jack-admin kill-server
./prebuilts/sdk/tools/jack-admin start-server
for cm you can use
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4g"
jack-admin kill-server && jack-admin start-server
This resolved the issue for me.

The current way to set Xmx for jack is:
export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m"
out/host/linux-x86/bin/jack-admin kill-server
out/host/linux-x86/bin/jack-admin start-server

I also had this problem after updating to 6.0 My computer is an i7 laptop with 8GB of ram. It worked fine with v5.x and below.
The reason is not enough memory as the error message states. In the v6.x build, more Jack is used. In my case, reducing the number of Jacks to 1 resolved the issue.
I can now continue compiling with 8GB of ram.
$HOME/.jack-server/config.properties
jack.server.max-service=1
[100% 19740/19740]
#### make completed successfully (11:55:27 (hh:mm:ss)) ####

Android build (tested with 7.1.2) uses its own, private version of Jack (there could be a Jack toolchain installed elsewhere on the system), so you have to use Android-specific variables.
From https://android.googlesource.com/platform/prebuilts/sdk/+/master/tools/README-jack-server.md:
(search for "If you experience Jack compilations failing on Out of memory error.:")
To summarize:
$ # Stop the Jack server
$ jack-admin stop-server
$ # apply the new setting
$ export ANDROID_JACK_VM_ARGS="-Xmx2g -Dfile.encoding=UTF-8 -XX:+TieredCompilation"
$ Finally, restart the build (do not manually start the Jack server!)
$ m # or any other build command
The build system should pick up the change and output the line:
Environment variable ANDROID_JACK_VM_ARGS was set, regenerating...
or (after a subsequent change):
Environment variable ANDROID_JACK_VM_ARGS was modified (-Xmx2g -Dfile.encoding=UTF-8 -XX:+TieredCompilation => -Xmx4g -Dfile.encoding=UTF-8 -XX:+TieredCompilation), regenerating...

I found this article:
Building AOSP 7.x Nougat with only 8 GiB RAM
on an 8 GiB machine, Max Heap size is less than 2 GiB:
$ java -XshowSettings 2>&1 | grep Heap
Max. Heap Size (Estimated): 1.71G
The solution
Once I understood the problem, it was just a question of changing the default heap size when jack-server is launched. To fix it, you need to edit
~/.jack-settings, and add this line
JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m"
Then, restart jack-server – otherwise if it is running in the background it will continue to use the old Xmx value:
$ prebuilts/sdk/tools/jack-admin kill-server
$ prebuilts/sdk/tools/jack-admin start-server
Launching Jack server java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=/tmp -Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4096m
-cp /home/chris/.jack-server/launcher.jar com.android.jack.launcher.ServerLauncher

This was also my problem: the java default Xmx setting was already close to 4GB (precisely: 4011MB) so the issue was rather the number of concurrent jack servers running. My machine had 8 CPUs but only 16GB of RAM, but would have required 32GB (8*4=32).
My (slightly more dynamic) solution:
MAX=$(($(free -g | awk '/^Mem:/{print $NF}') / 4))
if [ $MAX -le 0 ]; then
MAX=1
fi
echo "SERVER_NB_COMPILE=$MAX" >> ~/.jack
mkdir -p ~/.jack-server
echo "jack.server.max-service=$MAX" >> ~/.jack-server/config.properties
It adds the MAX number of jack server to both the old-location and new-location based on the android official doc:
Jack Troubleshooting: If your computer becomes unresponsive during compilation or if you experience Jack compilations failing on “Out of memory error”, you can improve the situation by reducing the number of Jack simultaneous compilations by editing your $HOME/.jack and changing SERVER_NB_COMPILE to a lower value. https://source.android.com/source/jack.html

Issue compiling Android 6.0 using Jack Server

I never had a problem compiling the AOSP version until 5.x. Now I'm trying to compile Android 6.0, which switched toolchain and uses Jack (Java Android Compiler Kit) but the compilation aborts.
The error seems to be related with a problem in compiling C object files, so the ld linker at some point starts producing file is empty errors such as the following one:
host SharedLib: libart (out/host/linux-x86/obj/lib/libart.so)
prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.8//x86_64-linux/bin/ld: error: out/host/linux-x86/obj/SHARED_LIBRARIES/libart_intermediates/check_jni.o: file is empty
When I check these files their size is 0 bytes. I tried the process two times before writing this, but every time the make process stops with the follosing error:
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [out/host/linux-x86/obj/lib/libart.so] Error 1
Have you experienced something like this and found a solution?

Cannot build cordova project successfully error while executing ant debug command

I was having an error that is Camera not successful invoked on first try (click) so I tried this solution on stackoverflow Phonegap(3.0.0) Camera not successful on first try.
I followed the steps as mentioned in the answer removed android by cordova platform remove android then I run the second command cordova platform add android ;
Now when I use netbeans to run the cordova application on cordova android decvice this error occurs:
exec: ant debug -f "/var/www/mobile/platforms/android/build.xml"
[ 'ant debug -f "/var/www/mobile/platforms/android/build.xml"',
{ [Error: Command failed:
BUILD FAILED
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:720: The following error occurred while executing this line:
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:734: Compile failed; see the compiler error output for details.
Total time: 8 seconds
] killed: false, code: 1, signal: null },
'Buildfile: /var/www/mobile/platforms/android/build.xml\n\n-set-mode-check:\n\n-set-debug-files:\n\n-check-env:\n [checkenv] Android SDK Tools Revision 22.3.0\n [checkenv]
.
.
.**LONG TEXT which I removed from the post **
.
\nBUILD FAILED\n/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:720:
The following error occurred while executing this line:\n/var/www/adt-bundle-linux-x86_64- 20130917/sdk/tools/ant/build.xml:734:
Compile failed; see the compiler error output for details.\n\nTotal time: 8 seconds\n' ]
Error executing "ant debug -f "/var/www/mobile/platforms/android/build.xml"":
BUILD FAILED
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:720: The following error occurred while executing this line:
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:734: Compile failed; see the compiler error output for details.
Total time: 8 seconds
child_process.spawn(/var/www/mobile/platforms/android/cordova/build,[]) = 2
/usr/local/lib/node_modules/cordova/node_modules/q/q.js:126
throw e;
Error: An error occurred while building the android project.Error executing "ant debug -f "/var/www/mobile/platforms/android/build.xml"":
BUILD FAILED
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:720: The following error occurred while executing this line:
/var/www/adt-bundle-linux-x86_64-20130917/sdk/tools/ant/build.xml:734: Compile failed; see the compiler error output for details.
Total time: 8 seconds
at ChildProcess.<anonymous> (/usr/local/lib/node_modules/cordova/src/compile.js:65:22)
at ChildProcess.EventEmitter.emit (events.js:98:17)
at maybeClose (child_process.js:735:16)
at Socket.<anonymous> (child_process.js:948:11)
at Socket.EventEmitter.emit (events.js:95:17)
at Pipe.close (net.js:466:12)
/var/www/mobile/nbproject/build.xml:256: exec returned: 8
BUILD FAILED (total time: 4 minutes 36 seconds)
any idea about this problem?

I was having a similar issue. I ran ant debug -f "/path/to/project/build.xml" from a separate terminal. It displayed a more specific description of the error (which for me wast that there was a space in the project name). This answer also notes:
config.xml can't have a widget id with number as a first character
after a dot. For example: com.42myapp.test or com.myapp.42test won't
work as well as 42com.myapp.test. It will trigger an error from the
compiler.

I was facing similar issues when i started using the CLI to build apps using cordova and started checking the internet for solutions. While i was at it, i discovered the following things that may help you or anyone else facing the same problem can take some hints from this:
These are some very basic checks that you need to take
1. make sure you have all the required sdk's in place (ANT, Java, Android) and is available when you use these commands on the terminal/command $ ant $ java $ adt. if any of these commands are not found, then you need to get it installed or get the class paths fixed.
make sure your project path does not have spaces. i.e. do not have spaces or special characters in directory names. this issue seems to have been fixed on latest versions of cordova and phonegap, but either cases it is a good practice to follow as ant and java paths could be dependent on the folder names you make.
use -d or -v to get extra debug information on the build process to know where and what is causing the issue. $ cordova build android -d or $ cordova build android -v
Make sure you dont use "#" as the link attribute of author tag in the cordova config.xml on the root of the project. This expects the compiler to interpret a hexadecimal color and fails the build. (this was my problem)
Hope this helps.
er... Happy debugging??

Make sure your Ant is 1.8.0 or later version. Cordova 3.3 demands that.

In the past several days, I found that the conflicting files from Dropbox had a very long name. After renaming it, everything worked.