Fixing empty truststore-config in Kafka Streams binder

[babubabu]

• do not copy truststore, if "ssl.truststore.location" is set to empty string (e.g. ssl.truststore.location:{ENV_VARIABLE})

The Config worked until version 4.0.4 :-)

Error was: Caused by: java.lang.IllegalStateException: java.io.FileNotFoundException: class path resource [${TRUSTSTORE_PATH}] cannot be opened because it does not exist at org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties.moveCertsToFileSystemIfNecessary(KafkaBinderConfigurationProperties.java:199) at org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties.getKafkaConnectionString(KafkaBinderConfigurationProperties.java:183) at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.normalalizeBootPropsWithBinder(KafkaTopicProvisioner.java:300) at org.springframework.cloud.stream.binder.kafka.provisioning.KafkaTopicProvisioner.(KafkaTopicProvisioner.java:140) at org.springframework.cloud.stream.binder.kafka.config.KafkaBinderConfiguration.provisioningProvider(KafkaBinderConfiguration.java:118) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:139) ... 161 more Caused by: java.io.FileNotFoundException: class path resource [${TRUSTSTORE_PATH}] cannot be opened because it does not exist at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:211) at org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties.moveCertToFileSystem(KafkaBinderConfigurationProperties.java:243) at org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties.moveCertsIfApplicable(KafkaBinderConfigurationProperties.java:208) at org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties.moveCertsToFileSystemIfNecessary(KafkaBinderConfigurationProperties.java:191)

[sobychacko]

Could you add your name as an @author to the classes you modify and update any copyright years? Thanks!

[babubabu]

@sobychacko : Done! Thanks for review the copyright was right, already. I squahed the two commits

[sobychacko]

Thanks for the PR. It is now merged upstream to main and back-ported to 4.0.x.

[babubabu]

Thank you