为什么我的gradle构建失败，但是gradlew构建成功？

Question

I have a gradle project that I am trying to build.

when I execute gradle clean build , it fails with the following error message

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':FacebookUpdateDependencies'.
> Could not resolve all dependencies for configuration ':compiler'.
   > Could not resolve com.company.facebook:compiler:1.2+.
     Required by:
         ::1.0
      > Could not resolve com.company.facebook:compiler:1.2+.
         > Failed to list versions for com.company.facebook:compiler.
            > Unable to load Maven meta-data from http://mycompanynexus/compiler/maven-metadata.xml.
               > Could not GET 'http://mycompanynexus/compiler/maven-metadata.xml'. Received status code 500 from server: Internal Server Error

However, when I tried ./gradlew clean build the build is successful.

why the build fails in the former and not the latter?

here is revelant portion of build.gradle

task wrapper(type: Wrapper) {
    gradleVersion = '2.11'
}

EDIT

local$: gradle -v

------------------------------------------------------------
Gradle 2.13
------------------------------------------------------------

Build time:   2016-04-25 04:10:10 UTC
Build number: none
Revision:     3b427b1481e46232107303c90be7b05079b05b1c

Groovy:       2.4.4
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.7.0_79 (Oracle Corporation 24.79-b02)
OS:           Mac OS X 10.11.1 x86_64

local$ ./gradlew -v

------------------------------------------------------------
Gradle 1.12
------------------------------------------------------------

Build time:   2014-04-29 09:24:31 UTC
Build number: none
Revision:     a831fa866d46cbee94e61a09af15f9dd95987421

Groovy:       1.8.6
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
Ivy:          2.2.0
JVM:          1.7.0_79 (Oracle Corporation 24.79-b02)
OS:           Mac OS X 10.11.1 x86_64

Answer 1

I just noticed that the wrapper version is 1.12 and not 2.12 . That is, there is a very large version difference between the wrapper and the installed version of gradle. There have probably been many incompatible changes to the different gradle plugins over the last 2 years, which may lead to the build problems you observe.

As already mentioned the gradle wrapper is a separate version of gradle that resides in the gradle/wrapper folder of your project. The wrapper is only built/updated, when executing the wrapper task in your project ( gradle wrapper ). That is your project's wrapper has not been updated for the last 2 years or has been created with the wrong version initially ( 1.12 instead of 2.11 ).

Given the above it's hard the tell what is actually causing the build to fail - apart from the incompatibilities between gradle 1.12 and 2.13 . But this version mismatch is probably the root cause of your problem.

Most likely your project won't built anymore using the wrapper once you regenerated the wrapper with version 2.11 (the version mentioned in the build file), as 2.11 is likely to be incompatible to 1.12 as well...

Answer 2

This tells you that your Gradle version 2.11 will be used when gradlew command is invoked instead of the one installed on system. Always run gradlew command as it ensures your build is run against the gradle version it is supposed to, you are never required to install the correct version of gradle and really speeds up the build time.

Here is an excerpt from Gradle Wrapper definition:

Most tools require installation on your computer before you can use them. If the installation is easy, you may think that's fine. But it can be an unnecessary burden on the users of the build. Equally importantly, will the user install the right version of the tool for the build? What if they're building an old version of the software?

The Gradle Wrapper (henceforth referred to as the “Wrapper”) solves both these problems and is the preferred way of starting a Gradle build. If a Gradle project has set up the Wrapper (and we recommend all projects do so), you can execute the build using one of the following commands from the root of the project:

./gradlew (on Unix-like platforms such as Linux and Mac OS X) gradlew (on Windows using the gradlew.bat batch file) Each Wrapper is tied to a specific version of Gradle, so when you first run one of the commands above for a given Gradle version, it will download the corresponding Gradle distribution and use it to execute the build.