[MNG-7009] Maven-compiler-3.1 cannot find symbol

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 3.6.0, 3.6.3
• Component/s: Errors, Plugins and Lifecycle

Environment

bo@ubontu20:~/Downloads$ java -version
openjdk version "1.8.0_272"
OpenJDK Runtime Environment (build 1.8.0_272-8u272-b10-0ubuntu1~20.04-b10)
OpenJDK 64-Bit Server VM (build 25.272-b10, mixed mode)
bo@ubontu20:~/Downloads$ mvn --version
Apache Maven 3.6.3
Maven home: /usr/share/maven
Java version: 1.8.0_272, vendor: Private Build, runtime: /usr/lib/jvm/java-8-openjdk-amd64/jre
Default locale: en_CA, platform encoding: UTF-8
OS name: "linux", version: "5.4.0-52-generic", arch: "amd64", family: "unix"

• External issue URL: https://stackoverflow.com/questions/64656908/maven-compiler-3-1-cannot-find-symbol
• Assignee: Unassigned
• Reporter: BO YANG
• Created: 03/Nov/20 15:38
• Updated: 04/Nov/20 07:53
• Resolved: 04/Nov/20 07:53

Description

The project could be compiled by eclipse. But when I package use maven by `mvn clean package`,  it reports some symbols cannot find. Below is the full output. It is a demo project to reproduce the error (https://github.com/boyang9602/demo).

```

~/eclipse-workspace/demo (master|✚ 2) ✔ $ mvn compile
[INFO] Scanning for projects...
[INFO]
[INFO] -------------------------< com.github:demo >--------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] -------------------------------[ jar ]--------------------------------
[INFO]
[INFO] — maven-resources-plugin:2.6:resources (default-resources) @ demo —
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] — maven-compiler-plugin:3.1:compile (default-compile) @ demo —
[INFO] Changes detected - recompiling the module!
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 1 source file to /home/bo/eclipse-workspace/demo/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /home/bo/eclipse-workspace/demo/src/main/java/demo/Demo.java:[16,79] cannot find symbol
symbol: variable line
location: class java.lang.Object
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.876 s
[INFO] Finished at: 2020-11-03T09:42:37-05:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project demo: Compilation failure
[ERROR] /home/bo/eclipse-workspace/demo/src/main/java/demo/Demo.java:[16,79] cannot find symbol
[ERROR] symbol: variable line
[ERROR] location: class java.lang.Object
[ERROR]
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

```

I also created a stack overflow post, where it has a more detailed description about what I did: https://stackoverflow.com/questions/64656908/maven-compiler-3-1-cannot-find-symbol