sijie opened a new issue #3734: NullPointerException at using BytesSchema.of() URL: https://github.com/apache/pulsar/issues/3734 **Describe the bug** Exception occurred when using `BytesSchema.of()` ``` Exception in thread "main" java.lang.ExceptionInInitializerError at org.apache.pulsar.examples.simple.ProducerExample.main(ProducerExample.java:32) Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at org.apache.pulsar.client.internal.ReflectionUtils.catchExceptions(ReflectionUtils.java:36) at org.apache.pulsar.client.internal.DefaultImplementation.newKeyValueSchema(DefaultImplementation.java:158) at org.apache.pulsar.client.api.Schema.<clinit>(Schema.java:123) ... 1 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.pulsar.client.internal.DefaultImplementation.lambda$newKeyValueSchema$16(DefaultImplementation.java:160) at org.apache.pulsar.client.internal.ReflectionUtils.catchExceptions(ReflectionUtils.java:34) ... 3 more Caused by: java.lang.NullPointerException at org.apache.pulsar.client.impl.schema.KeyValueSchema.<init>(KeyValueSchema.java:68) ... 9 more ``` **To Reproduce** You can use following code to reproduce ``` try (PulsarClient client = PulsarClient.builder() .serviceUrl(pulsarServiceUrl) .build()) { try (Producer<byte[]> producer = client.newProducer(BytesSchema.of()) .topic(topic) .create() ) { producer.send("hello world".getBytes(UTF_8)); } } catch (PulsarClientException pce) { LOG.error("Failed to produce messages to " + pulsarServiceUrl, pce); } ``` **Expected behavior** No exceptions should be thrown. **Additional context** This happens on 2.3.0. It is related to #3309 . After separating api module from client module, we are using reflection to construct implementations. This approach caused some static initialization are not executed correctly.
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