Failing to load data from an in-memory resource file

[vruusmann]

Reportedly, FileTranspiler works, but InMemoryTranspiler fails with the following exception:

Exception in thread "main" java.util.ServiceConfigurationError: org.dmg.pmml.PMML: Provider com.mycompany.MyModel could not be instantiated
        at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:582)
        at java.base/java.util.ServiceLoader$ProviderImpl.newInstance(ServiceLoader.java:804)
        at java.base/java.util.ServiceLoader$ProviderImpl.get(ServiceLoader.java:722)
        at java.base/java.util.ServiceLoader$3.next(ServiceLoader.java:1393)
        at org.jpmml.model.ServiceLoaderUtil.load(ServiceLoaderUtil.java:30)
        at org.jpmml.model.PMMLUtil.load(PMMLUtil.java:58)
        at org.jpmml.transpiler.InMemoryTranspiler.transpile(InMemoryTranspiler.java:40)
        at org.jpmml.transpiler.TranspilerTransformer.apply(TranspilerTransformer.java:40)
        at org.jpmml.evaluator.LoadingModelEvaluatorBuilder.transform(LoadingModelEvaluatorBuilder.java:142)
Caused by: java.lang.ExceptionInInitializerError
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
        at java.base/java.util.ServiceLoader$ProviderImpl.newInstance(ServiceLoader.java:780)
        ... 8 more
Caused by: java.lang.NullPointerException: Cannot invoke "java.io.InputStream.read()" because "this.in" is null
        at java.base/java.io.DataInputStream.readUnsignedShort(DataInputStream.java:343)
        at java.base/java.io.DataInputStream.readUTF(DataInputStream.java:595)
        at java.base/java.io.DataInputStream.readUTF(DataInputStream.java:570)
        at org.jpmml.evaluator.ResourceUtil.readStrings(ResourceUtil.java:98)
        at org.jpmml.evaluator.ResourceUtil.readFieldNames(ResourceUtil.java:39)
        at com.mycompany.MyModel.<clinit>(MyModel.java:60)
        ... 14 more
        Suppressed: java.lang.NullPointerException: Cannot invoke "java.io.InputStream.close()" because "this.in" is null
                at java.base/java.io.FilterInputStream.close(FilterInputStream.java:179)
                at com.mycompany.MyModel.<clinit>(MyModel.java:59)
                ... 14 more