Failed to install android-sdk: "java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema"

When installing the android sdk tools the following error is emitted: >java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema

Why is this happening and how can it be fixed?

Debug output:

$ java --version
java 9
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)
$ brew cask install android-sdk
==> Caveats
We will install android-sdk-tools, platform-tools, and build-tools for you.
You can control android sdk packages via the sdkmanager command.
You may want to add to your profile:
  'export ANDROID_SDK_ROOT=/usr/local/share/android-sdk'

This operation may take up to 10 minutes depending on your internet connection.
Please, be patient.

==> Satisfying dependencies
==> Downloading https://dl.google.com/android/repository/sdk-tools-darwin-3859397.zip
Already downloaded: /Users/tomasnovella/Library/Caches/Homebrew/Cask/android-sdk--3859397,26.0.1.zip
==> Verifying checksum for Cask android-sdk
==> Installing Cask android-sdk
==> Exception in thread "main"
==> java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
==> 	at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
==> 	at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
==> 	at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
==> 	at com.android.sdklib.tool.SdkManagerCli.main(SdkManagerCli.java:117)
==> 	at com.android.sdklib.tool.SdkManagerCli.main(SdkManagerCli.java:93)
==> Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
==> 	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
==> 	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
==> 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
==> 	... 5 more
Error: Command failed to execute!

==> Failed command:
/usr/local/Caskroom/android-sdk/3859397,26.0.1/tools/bin/sdkmanager tools platform-tools build-tools;26.0.1

==> Standard Output of failed command:


==> Standard Error of failed command:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
	at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
	at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
	at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
	at com.android.sdklib.tool.SdkManagerCli.main(SdkManagerCli.java:117)

Just had this error, solved by downloading the Android SDK Command-line Tools (latest) on Android Studio, under Preferences > Appearance & Behavior > System Settings > Android SDK > SDK Tools and re-running flutter doctor --android-licenses

Finally, add the new tools to your PATH, in your .bashrc, .zshrc or similar, before the obsolete tools:

export PATH=$PATH:$ANDROID_HOME/cmdline-tools/latest/bin

I had a similar problem this morning (trying to build for Android using Unity3D). I ended up uninstalling JDK9 and installing Java SE Development Kit 8u144. Hope this helps.

1. brew cask uninstall java # uninstall java9
2. brew tap homebrew/cask-versions
3. brew cask install java8 # install java8
4. touch ~/.android/repositories.cfg # without this file, error will occur on next step
5. brew install --cask android-sdk

• I also had this error

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
        at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
        at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
        at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
        at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
        at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
        ... 5 more

• then instead of uninstalling the latest java environment, (in my case it is java 13)
• and installation of java 8,
• I have done the following steps
• open the android studio > go to configure > select sdk manager > go to sdk tools > make a tick on android sdk command line tools >apply > and wait for installation

• restart the command line tool

• enter the command flutter doctor

• enter the command flutter doctor --android-licenses

• and accept all the licenses by typing y

To solve this error, you can downgrade your Java version.

Or exports the following option on your terminal:

Linux/MAC:

export JAVA_OPTS='-XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee'

Windows:

set JAVA_OPTS=-XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee

If this does not work try to exports the java.xml.bind instead.

Linux:

export JAVA_OPTS='-XX:+IgnoreUnrecognizedVMOptions --add-modules java.xml.bind'

Windows:

set JAVA_OPTS=-XX:+IgnoreUnrecognizedVMOptions --add-modules java.xml.bind

And to save it permanently you can exports the JAVA_OPTS in your profile file on Linux (.zshrc, .bashrc and etc.) or add it as an environment variable permanently on Windows.

---

ps. This doesn't work for Java 11/11+, which doesn't have Java EE modules. For this option is a good idea, downgrade your Java version or wait for a Flutter update.

Ref: JDK 11: End of the road for Java EE modules

set JAVA_OPTS=-XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee

This fixed the problem on Windows for me.

Source 1, source 2

Update 2019-10:

As stated in the issue tracker, Google has been working on a new Android SDK Command-line Tools release that runs on current JVMs (9, 10, 11+) and does not depend on deprecated JAXB EE modules!

You can download and use the new Android SDK Command-line Tools inside Android Studio or by manually downloading them from the Google servers:

• SDK Tools for Linux
• SDK Tools for Mac OS
• SDK Tools for Windows

For the latest versions check the URLs inside the repository.xml.

If you manually unpack the command line tools, take care of placing them in a subfolder inside your $ANDROID_HOME (e.g. $ANDROID_HOME/cmdline-tools/...).

Update 2021-03:

The latest stable command-line tools are available at Googles Downloads-Website. These tools are newer than those linked above.

If you don't want to change your Java version (I don't), you can temporarily change the version in your shell:

First run

/usr/libexec/java_home -V

Then pick a major version if you have it installed, otherwise install it first:

export JAVA_HOME=`/usr/libexec/java_home -v 1.8`

Now you can run sdkmanager.

When using Linux, an easy option is installation of JDK version 8 then selecting it as the default using:

sudo update-alternatives --config java

On Mac/Linux use the following command:

export JAVA_OPTS='-XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee'

Works for both JDK 9 and 10, without patching any script (sdkmanager, avdmanager).

For Java 11 see: https://stackoverflow.com/a/51644855/798165

You need to add the following to your Profile (Works on MacOS):

> export JAVA_HOME=/usr/libexec/java_home -v 1.8

No need to patch anything.

I was using macOS and while building the flutter application an error occurred saying android sdk licenses not accepted. So, while accepting the license this error occurred.

Reason for this error in my case was I haven't installed sdkmanager command line tools which is required to accept the license.

So, to install command line tools easiest way is:

1. Open android studio.
2. Open SDK Manager (refer image below):

3. Select SDK tools inside it in bar.
4. Tick the option Android SDK Command-line Tools (latest)
5. Apply it.
6. Run flutter doctor -android-licenses if using flutter or you can continue with the process where the error occurred.

I found two answers that worked for me, without having to uninstall JDK 10 (or 9), which I need for create-react-app. Both JDK 9 and 10 are incompatible with android-sdk !

---

Siu Ching Pong -Asuka Kenji- suggests modifying the sdkmanager script, replacing this line:

DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME"'  

with:

DEFAULT_JVM_OPTS='"-Dcom.android.sdklib.toolsdir=$APP_HOME" -XX:+IgnoreUnrecognizedVMOptions --add-modules java.se.ee'

Note that this mod will be overwritten when updating sdkmanager.
Check out his post, and the one he links to, for more details.
This solution was also one of the solutions mentioned in this github issues thread.

---

German's post indicates the source of the conflict, and presents fix that will not not be overwritten by updates.
He suggests renaming /Library/Java/JavaVirtualMachines/Info.plist as a means of obscuring it from the script that looks for the highest version of Java that resides on your system. In this way, JDK 8 is returned as the default.
Referring to JDK 10 explicitly, or by setting it to $JAVA_HOME, you can use JDK 10 , instead of the default, whenever needed.
Details are in his post.

Strangely Java9 is not compatible with android-sdk

$ avdmanager
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
	at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
	at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
	at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
	at com.android.sdklib.tool.AvdManagerCli.run(AvdManagerCli.java:213)
	at com.android.sdklib.tool.AvdManagerCli.main(AvdManagerCli.java:200)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
	... 5 more

Combined all commands into one for easy reference:

$ sudo rm -fr /Library/Java/JavaVirtualMachines/jdk-9*.jdk/
$ sudo rm -fr /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin
$ sudo rm -fr /Library/PreferencePanes/JavaControlPanel.prefPane

$ /usr/libexec/java_home -V
Unable to find any JVMs matching version "(null)".
Matching Java Virtual Machines (0):
Default Java Virtual Machines (0):
No Java runtime present, try --request to install

$ brew tap caskroom/versions
$ brew cask install java8
$ touch ~/.android/repositories.cfg
$ brew cask install android-sdk
$ echo 'export ANDROID_SDK_ROOT="/usr/local/share/android-sdk"' >> ~/.bash_profile
$ java -version
java version "1.8.0_162"
Java(TM) SE Runtime Environment (build 1.8.0_162-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.162-b12, mixed mode)
$ avdmanager

Usage:
      avdmanager [global options] [action] [action options]
      Global options:
  -s --silent     : Silent mode, shows errors only.
  -v --verbose    : Verbose mode, shows errors, warnings and all messages.
     --clear-cache: Clear the SDK Manager repository manifest cache.
  -h --help       : Help on a specific command.

Valid actions are composed of a verb and an optional direct object:
-   list              : Lists existing targets or virtual devices.
-   list avd          : Lists existing Android Virtual Devices.
-   list target       : Lists existing targets.
-   list device       : Lists existing devices.
- create avd          : Creates a new Android Virtual Device.
-   move avd          : Moves or renames an Android Virtual Device.
- delete avd          : Deletes an Android Virtual Device.

I faced the same problem. Though I am a little bit backdated developer (Still using windows to develop :P)

To solve this issue on windows :

STEP 1: Install jdk 8 if it wasn't installed (jdk 9 or 11 doesn't work but you may have them installed for using in other dev uses).

Very simple using Chocolatey: > choco install jdk8

(If installed using Chocolatey, skip steps 2 and 3)

STEP 2: Go to the Environment variables settings and set JAVA_HOME TO jdk 8's installation directory.

STEP 3: Go to path variable and add bin directory of jdk 8 and move it to top.

STEP 4: Close any open terminal sessions and restart a new session

OPTIONAL STEP 5: Depending on your objective in the terminal run (may need to add sdkmanager to path or just navigate to the directory):

> sdkmanager --update

That's all! :O Enjoy fluttering! :D

Since Java 11 has removed JavaEE you'll need to download some jars and add to the classpath:

JAXB: https://javaee.github.io/jaxb-v2/

JAF: https://www.oracle.com/technetwork/articles/java/index-135046.html

Then edit sdkmanager.bat so that set CLASSPATH=... ends with ;%CLASSPATH%

Set CLASSPATH to include JAXB and JAF:

set CLASSPATH=jaxb-core.jar;jaxb-impl.jar;jaxb-api.jar;activation.jar

Then sdkmanager.bat will work.

I ran into same issue when running:

$ /Users/<username>/Library/Android/sdk/tools/bin/sdkmanager "platforms;android-28" "build-tools;28.0.3"_

I solved it as

$ echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home    

$ ls /Library/Java/JavaVirtualMachines/

jdk-11.0.1.jdk		
jdk1.8.0_202.jdk

Change Java to use 1.8

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

Then the same command runs fine

$ /Users/<username>/Library/Android/sdk/tools/bin/sdkmanager "platforms;android-28" "build-tools;28.0.3"

In my case, I need both JDK 8 (trying to use the AVD and SDK manager in Qt under ubuntu) and 11 for different tools. Removing version 11 is not an option.

The 'JAVA_OPTS' solutions did not do anything. I don't really like the export JAVA_HOME, as it might force you do launch whatever tool calls these utils from the same shell (like Qt), or force you to make this permanent, which is not convenient.

So for me the solution is quite simple. Add something like this in the second line of ~/Android/tools/bin/sdkmanager and ~/Android/tools/bin/avdmanager:

JAVA_HOME="/usr/lib/jvm/java-8-openjdk-amd64"

(or whatever the path is to your rev 8 jdk).

With this, these command line tools work in a stand alone mode, they work also when called by other tools such as Qt, and jdk 11 is still the system default for others. No need to mix libs etc...

The only downside is that any update to these command line tools will erase these modifications, which you will have to put back in.

As of the latest version of the Android command-line tools (2.1 as of this writing), it is no longer necessary to patch sdkmanager nor to downgrade to an ancient version of Java.

Simply update your SDK packages and switch your command-line tools to the latest release, which will track new versions as they come:

sdkmanager --update
sdkmanager 'cmdline-tools;latest'
sdkmanager --uninstall 'cmdline-tools;1.0'

You may need to provide the full path to sdkmanager if it's not on your PATH, and you may need to adjust your PATH afterwards if it was referring to the 1.0 tools explicitly.

In my case, I have Java 14 and need Java 8.

I'm in a Arch Linux and has installed jdk8-openjdk jre8-openjdk https://www.archlinux.org/packages/extra/x86_64/java8-openjdk/

For Debian users https://wiki.debian.org/Java, or Fedora https://docs.fedoraproject.org/en-US/quick-docs/installing-java/.

Install Java 8 (or desired version, in this case jdk8-openjdk jre8-openjdk) using your package manager before doing the following steps.

---

1. Figuring out where is my Java:

# which java
/usr/bin/java

2. Checking java files:

I can see all java files here are links to /usr/lib/jvm/default[something]. This means that the java command is linked to some specific version of java executable.

# ls -l /usr/bin/java*
lrwxrwxrwx 1 root root 37 May 16 06:30 /usr/bin/java -> /usr/lib/jvm/default-runtime/bin/java
lrwxrwxrwx 1 root root 30 May 16 06:30 /usr/bin/javac -> /usr/lib/jvm/default/bin/javac
lrwxrwxrwx 1 root root 32 May 16 06:30 /usr/bin/javadoc -> /usr/lib/jvm/default/bin/javadoc
lrwxrwxrwx 1 root root 30 May 16 06:30 /usr/bin/javah -> /usr/lib/jvm/default/bin/javah
lrwxrwxrwx 1 root root 30 May 16 06:30 /usr/bin/javap -> /usr/lib/jvm/default/bin/javap

3. Checking the default and default-runtime

Here I could see the default version was linked to 14 (unique installed version).

# cd /usr/lib/jvm
# ls -l
lrwxrwxrwx 1 root root   14 Aug  8 20:44 default -> java-14-openjdk
lrwxrwxrwx 1 root root   14 Aug  8 20:44 default-runtime -> java-14-openjdk
drwxr-xr-x 7 root root 4096 Jul 19 22:38 java-14-openjdk
drwxr-xr-x 6 root root 4096 Aug  8 20:42 java-8-openjdk

4. Switching the default version

First, remove the existing default and default-runtime which linked to java-14 version.

# rm default default-runtime

Then, create new links to the desired version (in this case, java-8).

# ln -s java-8-openjdk default
# ln -s java-8-openjdk default-runtime

---

The strategy is to make links to the desired version of software (java8 in this case) using ln -s above. Then, this links are linked to the binaries inside the java bin directory (without changing the $PATH environment variable!)

---

Or you might be wanted to change the Java version using archlinux-java command instead with more safely approach: https://wiki.archlinux.org/index.php/Java

TLDR; Try setting JAVA_HOME worked fine for me on OSX

export JAVA_HOME=/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

To install the JDKs 8 ( LTS ) from AdoptOpenJDK:

# brew tap adoptopenjdk/openjdk

brew cask install adoptopenjdk/openjdk/adoptopenjdk8

This question has numerous answers, and they're all different due to users installing different toolchains and using different Java versions.

The recommended way of using Android development toolchain, or at least the one that I suggest to use, is to follow what's stated in Android Studio documentation:

> You should always keep your Build Tools component updated by downloading the latest version using the Android SDK Manager.

Android studio allows you to easily manage installed SDKs & build tools, yes, it requires some space on your hard drive, but it will save you some time. Once you get familiar with how it works, then you can think of installing command-line tools only.

If there's no particular reason of using older Java version, use the latest (stable) version, you will have interesting new features, and also the compiled application will benefit from all the new optimizations.

Fresh install

1. Delete your local Android folder, usually in the home directory
2. Download Android studio
3. Once installed, open Settings, Search Android SDK and open it
4. In SDK Platforms select the target Android version for your app
5. In SDK Tools tab, select Android SDK Build-Tools, Android SDK Command-line Tools (latest), Android Emulator, Android SDK Platform-Tools
6. Before pressing OK, check that Android SDK Location path is correct for you
7. Press OK and let Android Studio download & install everything

(Optional) if you need to use the installed binaries from command line, be sure to add their folder into your PATH variable. If you use Android studio, it's should not be required though.

I've got Java 14 installed on my machine, anyway you can use the jre shipped with Android Studio.

For Linux users (I'm using a Debian Distro, Kali) Here's how I resolved mine.

If you don't already have jdk-8, you want to get it at oracle's site

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

I got the jdk-8u191-linux-x64.tar.gz

Step 1 - Installing Java Move and unpack it at a suitable location like so

$ mv jdk-8u191-linux-x64.tar.gz /suitablelocation/
$ tar -xzvf /suitablelocation/jdk-8u191-linux-x64.tar.gz

You should get an unzipped folder like jdk1.8.0_191 You can delete the tarball afterwards to conserve space

Step 2 - Setting up alternatives to the default java location

$ update-alternatives --install /usr/bin/java java /suitablelocation/jdk1.8.0_191/bin/java 1
$ update-alternatives --install /usr/bin/javac javac /suitablelocation/jdk1.8.0_191/bin/javac 1

Step 3 - Selecting your alternatives as default

$ update-alternatives --set java /suitablelocation/jdk1.8.0_191/bin/java
$ update-alternatives --set javac /suitablelocation/jdk1.8.0_191/bin/javac

Step 4 - Confirming default java version

$ java -version

Notes

1. In the original article here: https://forums.kali.org/showthread.php?41-Installing-Java-on-Kali-Linux, the default plugin for mozilla was also set. I assume we don't really need the plugins as we're simply trying to develop for android.
2. As in @spassvogel's answer, you should also place a @repositories.cfg file in your ~/.android directory as this is needed to update the tools repo lists
3. Moving some things around may require root authority. Use sudo wisely.
4. For sdkmanager usage, see official guide: https://developer.android.com/studio/command-line/sdkmanager

In my case I didn't have the required sdk version installed on my machine.

So make sure that you have installed the sdk version which is given in the error.

Here you can navigate check & install via Android Studio.

For windows machine uninstall the JDK if its more than 1.8.172. Install JDK 1.8.172

I was facing the same issue in windows 10 with java 10. I uninstalled the java 10 and installed java8 its working fine for me now :)

Run java -version and javac -version commands in a command line to make sure that they come from the same JDK (eg: version 1.8.0_181)

If not, you have to modify PATH variable so that it only points to a single JDK. If you are not sure how to, just uninstall all other Java instances except for Java 8 (Add/Remove Programs in Windows). As for today, both Unity and Android recommends that you use JDK 8.

With Java 8, it is not necessary to export java.se.ee module as shown in some of the other answers. You may also remove any JAVA_OPTS or other environment variables that you have set.

I had recently solved this problem by uninstalling the higher version of JDK and installing JDK 8. After installing the JDK you need to give the path. Then you need to open command prompt in "C:\Users\Milan Adhikari\AppData\Local\Android\Sdk\tools" and run "sdkmanager --update" which will update your sdk and then you need to run "flutter doctor --android-licenses" in cmd and accept all the licenses.
Now your problem should be solved.

Best way is to use below command

   $ wget https://dl.google.com/android/repository/platform-tools-latest-linux.zip
   $ unzip \platform-tools-latest-linux.zip
   $ sudo cp platform-tools/adb /usr/bin/adb
   $ sudo cp platform-tools/fastboot /usr/bin/fastboot

Now run adb version to verify it’s been updated.

No need to uninstall your other java version(s) that's already installed on your machine. Whenever required, you can conveniently use the utility 'update-alternatives' to choose the Java runtime that you wish to activate. It will automagically update the required symbolic links.

You just need to run the below command and select the version of your choice. That's all!

sudo update-alternatives --config java

As @steven pointed out, install Java 8 (here a link for Ubuntu 16.04, 18.04 and 20.04/20.10 https://computingforgeeks.com/how-to-install-java-8-on-ubuntu/) and then set it as the default Java version with this command:

sudo update-alternatives --config java

Downgrade your java version.Whatever system or ide.

Make sure java version is not higher than 8

In my case.I change the ide java verion.This solves my issue.

When your Android stuio/jre uses a differ version of java, you will receive this error. to solve it, just set Android studio/jre to your JAVA_HOME. and uninstall your own java.

For me i install java version 8 and just select the java version in "JDK location":

For my circumstance, I'm using sdkman to manage multiple java versions. I set default java version to 13. Install version 8 and now it's working fine.

I was having the same issue and had installed openjdk-8-jdk as suggested. Checking javac -version resulted in the correct version, but java -version showed version 11.

The solution was to use:

sudo update-alternatives --config java

and select version 8 from the menu.

My Java version is 15.0.1 . For the OS Mac.

and this is how i fixed the issue.

1. downloaded zip: jaf-1_1_1.zip from: https://download.oracle.com/otn-pub/java/jaf/1.1.1/jaf-1_1_1.zip?AuthParam=1609860571_68ca6f30491c76e81970a3849504fb6a

2. downloaded the zip: jaxb-ri-2.3.1.zip from: https://download.oracle.com/otn-pub/java/jaf/1.1.1/jaf-1_1_1.zip?AuthParam=1609860571_68ca6f30491c76e81970a3849504fb6a

3. unziped into a folder: ~/jars/ . exported classpath as follows

export  
 CLASSPATH=~/jars/FastInfoset.jar:~/jars/activation.jar:~/jars/codemodel.jar:~/jars/dtd-parser.jar:~/jars/istack-commons-runtime.jar:~/jars/istack-commons-tools.jar:~/jars/jaf-1.1.1:~/jars/jaf-1_1_1.zip:~/jars/javax.activation-api.jar:~/jars/jaxb-api.jar:~/jars/jaxb-jxc.jar:~/jars/jaxb-ri:~/jars/jaxb-ri-2.3.1.zip:~/jars/jaxb-runtime.jar:~/jars/jaxb-xjc.jar:~/jars/relaxng-datatype.jar:~/jars/rngom.jar:~/jars/stax-ex.jar:~/jars/txw2.jar:~/jars/xsom.jar

1. next edit the file: cd ~/Library/Android/sdk/tools/bin/sdkmanager change the CLASSPATH to the below

CLASSPATH=$CLASSPATH:$APP...

save the file and run the command again.

Updated my current Android SDK and everything worked like a charm.

Got this error running "flutter doctor --android-licenses" In Windows 10. I solved it creating these two environment variables

ANDROID_SDK_ROOT
C:\Users\youruser\AppData\Local\Android\Sdk

ANDROID_SDK_HOME
C:\Users\youruser\.android

Refresh environment variables or reboot and then run the command again.