Common Troubleshooting and Workarounds for Java Frameworks

Java framework common problems and solutions: Dependency conflicts: avoid version conflicts through dependency management; HTTP 404: correctly start the Spring Boot application; JSON parsing error: disable unknown attribute failure function; database connection pool configuration error: configure the connection correctly Message; Async task processing failed: Enable asynchronous task processing and use the @Async annotation correctly.

Common troubleshooting and solutions for Java framework

When developing using Java framework, you may encounter some common problems question. This article describes these problems and their corresponding solutions.

Problem 1: Dependency conflict

Problem description:When introducing multiple dependencies, dependency conflicts may occur, causing the program to fail to compile .

Solution:

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava-parent</artifactId>
      <version>26.0-jre</version>
      <type>pom</type>
      <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

By using dependency management, dependency versions can be managed uniformly to avoid conflicts.

Issue 2: HTTP 404 Error

Problem Description:When using Spring Boot, the access controller may return an HTTP 404 error.

Solution:

@SpringBootApplication
public class App {
  public static void main(String[] args) {
    SpringApplication.run(App.class, args);
  }
}

Ensure that the Spring Boot application is started correctly in the main class.

Problem 3: JSON parsing error

Problem description:When using Jackson, you may encounter errors when parsing JSON.

Workaround:

ObjectMapper mapper = new ObjectMapper();
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

Unmapped properties in JSON can be ignored by disabling the failure for unknown properties feature.

Problem 4: Database connection pool configuration error

Problem description:When using HikariCP, database connection pool configuration error may cause connection problems.

Solution:

HikariConfig config = new HikariConfig();
config.setJdbcUrl("jdbc:mysql://localhost:3306/test");
config.setUsername("user");
config.setPassword("password");

Correctly configure the database connection information, including URL, username and password.

Problem 5: Asynchronous task processing fails

Problem description:When using Spring Task, asynchronous task processing may fail.

Solution:

@EnableAsync
public class App {
  @Async
  public void doAsync() {
    // 异步任务逻辑
  }
}

Make sure to enable asynchronous task processing in the main class and use the @Async annotation correctly.

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