英文:
Try/Catch Loop not triggering catch statement on IllegalStateException
问题
以下是您要翻译的内容：
我正在编写一个Spring Boot应用程序，其中有一个唯一的对象被持久化在数据库中，并可以通过以下CRUD Repository进行检索：
@Repository
public interface DefaultSurveyRepository extends CrudRepository<DefaultSurvey, UUID> {
public static final UUID specialId = UUID.fromString("123e4567-e89b-12d3-a456-556642440000");
default DefaultSurvey findSpecialInstance() {
return findById(specialId).orElseThrow(() -> new IllegalStateException("No Default Survey Found"));
}
}
在我的服务类构造函数中，我尝试查找对象的specialInstance，如果失败了我就创建一个新版本。代码如下：
@Service
@Transactional
public class AdminManagement {
private final DefaultSurveyRepository repo;
@Autowired
public AdminManagement(DefaultSurveyRepository repo) {
//检查defaultSurvey是否存在。
try{
repo.findSpecialInstance();
}
catch(IllegalStateException e){
repo.save(new DefaultSurvey(UUID.fromString("123e4567-e89b-12d3-a456-556642440000"), "[]"));
}
this.repo = Objects.requireNonNull(repo);
}
}
问题是它没有捕捉到IllegalStateException并崩溃，如果对象不存在的话。我已经尝试设置断点进行调试，但它在断点到达之前就崩溃了。也许我没有正确地进行调试，但我不明白为什么它不能正常工作。非常感谢您的所有帮助！
英文:
I am writing a spring boot application and have a unique object which is persisted in a database, and retrieved by the following CRUD Repository:
@Repository
public interface DefaultSurveyRepository extends CrudRepository <DefaultSurvey, UUID> {
public static final UUID specialId = UUID.fromString("123e4567-e89b-12d3-a456-556642440000");
default DefaultSurvey findSpecialInstance() {
return findById(specialId).orElseThrow(() -> new IllegalStateException("No Default Survey Found"));
}
}
In my service class constructor, I try to find the specialInstance of the object, and if this fails I create a new version. The code is the following:
@Service
@Transactional
public class AdminManagement {
private final DefaultSurveyRepository repo;
@Autowired
public AdminManagement(DefaultSurveyRepository repo) {
//Check if defaultSurvey exists.
try{
repo.findSpecialInstance();
}
catch(IllegalStateException e){
repo.save(new DefaultSurvey(UUID.fromString("123e4567-e89b-12d3-a456-556642440000"), "[]"));
}
this.repo = Objects.requireNonNull(repo);
}
.
.
.
The problem is that it does not catch the IllegalStateException and crashes, if the object does not exist. I have tried setting breakpoints to debug, but it crashes before the breakpoint is reached. Maybe I am not debugging correctly, but I do not understand why it won't work.
Any and all help is appreciated!
答案1
得分: 0
正如评论中提到的，最好实现CommandLineRunner。另一个“简单”的选项是将有关存储库初始化详细信息留在@PostConstruct中：
private final DefaultSurveyRepository repo;
@Autowired
public AdminManagement(DefaultSurveyRepository repo) {
this.repo = repo;
}
@PostConstruct
private void postConstruct() {
try {
repo.findSpecialInstance();
} catch (IllegalStateException e) {
repo.save(new DefaultSurvey(UUID.fromString("123e4567-e89b-12d3-a456-556642440000"), "[]"));
}
this.repo = Objects.requireNonNull(repo);
}
只需记住，Java EE注解在Java 9中已被弃用并在Java 11中被移除，因此您必须将其添加到Maven的pom.xml中：
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.2</version>
</dependency>
英文:
As mentioned in the comments, it would be better to implement CommandLineRunner. Another "simple" option is to leave the initialization details about your repo in @PostConstruct:
private final DefaultSurveyRepository repo;
@Autowired
public AdminManagement(DefaultSurveyRepository repo) {
this.repo = repo;
}
@PostConstruct
private void postConstruct() {
try{
repo.findSpecialInstance();
} catch(IllegalStateException e){
repo.save(new DefaultSurvey(UUID.fromString("123e4567-e89b-12d3-a456-556642440000"), "[]"));
}
this.repo = Objects.requireNonNull(repo);
}
Just remember that Java EE annotations have been deprecated in Java9 and removed in Java 11 so you must add that to your Maven pom.xml:
<dependency>
<groupId>javax.annotation</groupId>
<artifactId>javax.annotation-api</artifactId>
<version>1.3.2</version>
</dependency>
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论