Spring Boot 2.0.1嵌入式Tomcat无法启动问题求助

Hey there! Let’s work through fixing that embedded Tomcat loading problem you’re hitting with your Spring Boot 2.0.1 project. Based on your setup details (Java 10.0.1, Maven-generated via start.spring.io, local Tomcat 9), here are the most common fixes to try:

1. Verify Maven’s Java Version Configuration #

While Spring Boot 2.0.x officially supports Java 10, misconfigured compiler settings can cause subtle compatibility hiccups. Double-check your pom.xml to ensure it’s correctly targeting Java 10:

<properties>
    <java.version>10</java.version>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <!-- Use a version that fully supports Java 10 -->
            <version>3.8.0</version>
            <configuration>
                <release>10</release>
            </configuration>
        </plugin>
    </plugins>
</build>

Run mvn clean install after updating these settings to ensure all dependencies are properly compiled for your Java version.

2. Ensure Embedded Tomcat Dependencies Are Intact #

The spring-boot-starter-web dependency should include embedded Tomcat by default—make sure you haven’t accidentally excluded it or added conflicting servlet container dependencies. Confirm your pom.xml has this entry without any exclusions:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

If you added dependencies for Jetty or Undertow (other servlet containers), remove them if you intend to use Tomcat.

3. Fix Port Conflicts #

Embedded Tomcat defaults to port 8080—if your local Tomcat 9 instance is running and occupying this port, the embedded server can’t start. Try either:

• Stop your local Tomcat 9 service before launching the Spring Boot app
• Or, change the embedded Tomcat port in src/main/resources/application.properties:

  server.port=8081
  

4. Debug with Detailed Logs #

If the above steps don’t resolve the issue, enable debug logging to get clearer context about what’s failing. Add these lines to application.properties:

logging.level.org.springframework=DEBUG
logging.level.apache.tomcat=DEBUG

Look for specific errors in the console output—things like Address already in use (port conflict) or ClassNotFoundException (missing dependencies) will point you straight to the root cause.

Give these steps a shot, and if you can share the exact error logs from your startup, we can dive even deeper into the problem!

内容的提问来源于stack exchange，提问作者user2965706