yunlongn opened a new pull request, #5578:
URL: https://github.com/apache/shenyu/pull/5578
<!-- Describe your PR here; e.g. Fixes #issueNo -->
Steps To Reproduce
On the master branch, run the test case code.
```
public static void main(final String[] args) {
EurekaInstanceRegisterRepository eurekaInstanceRegisterRepository =
new EurekaInstanceRegisterRepository();
RegisterConfig config = new RegisterConfig();
config.setServerLists("http://localhost:8761/eureka/";);
eurekaInstanceRegisterRepository.init(config);
InstanceEntity instanceEntity = new InstanceEntity("shenyu",
"127.0.0.1", 12345);
eurekaInstanceRegisterRepository.selectInstances("other name");
eurekaInstanceRegisterRepository.persistInstance(instanceEntity);
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
```
error log:
```
Exception in thread "main" java.lang.NullPointerException
at
org.apache.shenyu.registry.eureka.EurekaInstanceRegisterRepository.getInstances(EurekaInstanceRegisterRepository.java:185)
at
org.apache.shenyu.registry.eureka.EurekaInstanceRegisterRepository.selectInstances(EurekaInstanceRegisterRepository.java:181)
at
org.apache.shenyu.registry.eureka.EurekaInstanceRegisterRepository.main(EurekaInstanceRegisterRepository.java:73)
```
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- [x] You submit test cases (unit or integration tests) that back your
changes.
- [x] Your local test passed `./mvnw clean install
-Dmaven.javadoc.skip=true`.
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