merlimat opened a new pull request #5445: Fixed StringSchema static initialization URL: https://github.com/apache/pulsar/pull/5445 ### Motivation Java doesn't guarantee the initialization order of the static fields of a class. Depending on the JVM version and race conditions, the StringSchema could be initialized with a null `DEFAULT_SCHEMA_INFO`. Eg: ``` ------------------------------------------------------------------------------- Tests run: 6, Failures: 1, Errors: 0, Skipped: 1, Time elapsed: 1.444 s <<< FAILURE! - in org.apache.pulsar.client.impl.schema.SchemaInfoTest testSchemaInfoToString(org.apache.pulsar.client.impl.schema.SchemaInfoTest) Time elapsed: 0.03 s <<< FAILURE! java.lang.NullPointerException at org.apache.pulsar.client.impl.schema.SchemaInfoTest.testSchemaInfoToString(SchemaInfoTest.java:276) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ```
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