To reproduce this issue:
- Install either Unity Editor 2019.3 or 2019.2 using the HUB
- install the Android Module and the Android SDK and NDK with the module
- start a new project
- set the platform to Android
- Open Player Settings
- Open the Other Settings section
- Inspect the Minimum API Level and Target API Level fields

Expected Result:
You can change the API levels and no errors appear in the console.

Actual Result:
The fields display "Getting API Levels..." and an error appears in the console:

CommandInvokationFailure: Failed to update Android SDK package list.
E:/Unity/Unity Versions/2019.2.0b1/Editor/Data/PlaybackEngines/AndroidPlayer\SDK\tools\bin\sdkmanager.bat --list

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

Reproducible in 2019.2.0a4, 2019.2.0b1, 2019.2.0b10 and 2019.3.0a10
Cannot reproduce in 2019.1.8f1