In Android, the client seems to be unable to instantiate the PointSettings class, possibly due to an error in the Pattern regex at this line :

private static final Pattern ENV_PROPERTY = Pattern.compile("(\$\{env\.)(.+)(})");

----- begin exception -----
I/TestRunner: java.lang.NoClassDefFoundError: com.influxdb.client.write.PointSettings
at com.influxdb.client.InfluxDBClientOptions$Builder.(InfluxDBClientOptions.java:220)
at com.influxdb.client.InfluxDBClientOptions.builder(InfluxDBClientOptions.java:199)
at com.influxdb.client.InfluxDBClientFactory.create(InfluxDBClientFactory.java:108)
at in.silentclap.sixpetal.facade.DbMethods.(DbMethods.java:72)
at in.silentclap.sixpetal.ExampleInstrumentedTest.checkConnection(ExampleInstrumentedTest.java:38)
at java.lang.reflect.Method.invoke(Native Method)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at android.support.test.runner.AndroidJUnit4.run(AndroidJUnit4.java:101)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:56)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:384)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2189)
Caused by: java.lang.ExceptionInInitializerError
at com.influxdb.client.InfluxDBClientOptions$Builder.(InfluxDBClientOptions.java:220)
at com.influxdb.client.InfluxDBClientOptions.builder(InfluxDBClientOptions.java:199)
at com.influxdb.client.InfluxDBClientFactory.create(InfluxDBClientFactory.java:108)
at in.silentclap.sixpetal.facade.DbMethods.(DbMethods.java:72)
at in.silentclap.sixpetal.ExampleInstrumentedTest.runOnceAfterDBCreation(ExampleInstrumentedTest.java:32)
at java.lang.reflect.Method.invoke(Native Method) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at android.support.test.runner.AndroidJUnit4.run(AndroidJUnit4.java:101) 
at org.junit.runners.Suite.runChild(Suite.java:128) 
at org.junit.runners.Suite.runChild(Suite.java:27) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at org.junit.runner.JUnitCore.run(JUnitCore.java:137) 
at org.junit.runner.JUnitCore.run(JUnitCore.java:115) 
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:56) 
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:384) 
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2189) 
Caused by: java.util.regex.PatternSyntaxException: Syntax error in regexp pattern near index 17
(${env.)(.+)(})
^
at java.util.regex.Pattern.compileImpl(Native Method)
at java.util.regex.Pattern.compile(Pattern.java:1433)
at java.util.regex.Pattern.(Pattern.java:1408)
at java.util.regex.Pattern.compile(Pattern.java:966)
at com.influxdb.client.write.PointSettings.(PointSettings.java:42)
... 33 more
----- end exception -----