我想啟動一個帶有除錯選項的 docker 容器，如下所示，但啟動不起作用：
Dockerfile：
# syntax=docker/dockerfile:1
FROM maven:3-eclipse-temurin-11 as dependencies
WORKDIR /opt/app
COPY .dockerdev/settings.xml .
COPY pom.xml .
COPY src src
ENTRYPOINT["mvn", "spring-boot:run"]
docker-compose.yml：
version: '3.7'
services:
app:
environment:
- "JAVA_TOOL_OPTIONS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005"
ports:
- 8080:8080
- 5005:5005
結果：
docker-compose up
Recreating my_app ... done
Attaching to my_app
app_1 | Picked up JAVA_TOOL_OPTIONS: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005
app_1 | Listening for transport dt_socket at address: 5005
app_1 | [INFO] Scanning for projects...
app_1 | [INFO] --- maven-resources-plugin:3.2.0:resources (default-resources) @ my_app ---
app_1 | [INFO] Using 'UTF-8' encoding to copy filtered resources.
app_1 | [INFO] Using 'UTF-8' encoding to copy filtered properties files.
app_1 | [INFO] Copying 3 resources
app_1 | [INFO] Copying 3 resources
app_1 | [INFO]
app_1 | [INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ my_app ---
app_1 | [INFO] Changes detected - recompiling the module!
app_1 | [INFO]
app_1 | [INFO] --- maven-resources-plugin:3.2.0:testResources (default-testResources) @ my_app ---
app_1 | [INFO] Using 'UTF-8' encoding to copy filtered resources.
app_1 | [INFO] Using 'UTF-8' encoding to copy filtered properties files.
app_1 | [INFO] Copying 3 resources
app_1 | [INFO]
app_1 | [INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ my_app ---
app_1 | [INFO] Changes detected - recompiling the module!
app_1 | [INFO] Compiling 5 source files to /opt/app/target/test-classes
app_1 | [INFO]
app_1 | [INFO] <<< spring-boot-maven-plugin:2.6.7:run (default-cli) < test-compile @ my_app <<<
app_1 | [INFO]
app_1 | [INFO]
app_1 | [INFO] --- spring-boot-maven-plugin:2.6.7:run (default-cli) @ my_app ---
app_1 | [INFO] Attaching agents: []
app_1 | Picked up JAVA_TOOL_OPTIONS: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005
app_1 | ERROR: transport error 202: bind failed: Address already in use
app_1 | ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
app_1 | JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [./src/jdk.jdwp.agent/share/native/libjdwp/debugInit.c:735]
app_1 | [INFO] ------------------------------------------------------------------------
app_1 | [INFO] BUILD FAILURE
app_1 | [INFO] ------------------------------------------------------------------------
app_1 | [INFO] Total time: 3.000 s
app_1 | [INFO] Finished at: 2022-05-23T12:30:50Z
app_1 | [INFO] ------------------------------------------------------------------------
app_1 | [ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.6.7:run (default-cli) on project my_app: Application finished with exit code: 2 -> [Help 1]
app_1 | [ERROR]
app_1 | [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
app_1 | [ERROR] Re-run Maven using the -X switch to enable full debug logging.
app_1 | [ERROR]
app_1 | [ERROR] For more information about the errors and possible solutions, please read the following articles:
app_1 | [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
my_app exited with code 1
旁注：埠 5005 當然不在我的主機上運行/監聽！此外，如果我將埠更改為 5006、5007 等，錯誤總是相同的。
那么為什么埠被封鎖了mvn spring-boot:run呢？
uj5u.com熱心網友回復：
您的解決方案的問題是正在啟動 2 個除錯會話。1 個用于 maven 命令，1 個用于分叉的 JVM voor Spring Boot。因此，錯誤和更改埠不會解決這個問題，因為問題仍然存在。
您需要做的是JAVA_TOOL_OPTIONS從您的 docker compose 檔案中洗掉，而是將以下內容添加到您的入口點
-Dspring-boot.run.jvmArguments=-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005
這樣，它將僅適用于 Spring Boot 插件，并且在新 JVM 中啟動應用程式時會被考慮在內。
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