由于“无法确定 Java 版本”错误，无法在 Mac 上的新项目上运行 grails 命令 [重复]

Question

我需要在 Mac 系统上运行现有的 grails 项目（在 Windows 上运行）。

在此之前，我正在尝试设置 grails 并运行“hello world”。我使用 sdkman 下载并安装了 grails。我的安装目录是 -

/Users/sandeepan.nath/Desktop/setups 我在其中创建了 grails 目录并运行了 sdk install grails 命令，该命令安装了 grails 并创建了这些 -

SandeepanNath:grails sandeepan.nath$ ls -lrth
total 80
-rw-r--r--   1 sandeepan.nath  1974079253    73B Jun  1 13:03 gradle.properties
drwxr-xr-x   3 sandeepan.nath  1974079253    96B Jun  1 13:03 gradle
-rwxr--r--   1 sandeepan.nath  1974079253   4.9K Jun  1 13:03 gradlew
-rwxr--r--   1 sandeepan.nath  1974079253   2.3K Jun  1 13:03 gradlew.bat
-rwxr--r--   1 sandeepan.nath  1974079253   4.6K Jun  1 13:03 grailsw
-rwxr--r--   1 sandeepan.nath  1974079253   2.3K Jun  1 13:03 grailsw.bat
drwxr-xr-x   5 sandeepan.nath  1974079253   160B Jun  1 13:03 src
-rw-r--r--   1 sandeepan.nath  1974079253   5.3K Jun  1 13:03 grails-wrapper.jar
drwxr-xr-x  12 sandeepan.nath  1974079253   384B Jun  1 13:03 grails-app
-rw-r--r--   1 sandeepan.nath  1974079253   2.9K Jun  1 13:03 build.gradle
drwxr-xr-x   2 sandeepan.nath  1974079253    64B Jun  1 13:03 build

我在 grails 目录中运行 grails create-app hello 来创建一个项目，但它失败了 -

SandeepanNath:hello sandeepan.nath$ grails create-app hello
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/Users/sandeepan.nath/.sdkman/candidates/grails/3.3.10/lib/org.codehaus.groovy/groovy/jars/groovy-2.4.17.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
| Error Error initializing classpath: Could not determine java version from '12.0.1'. (Use --stacktrace to see the full trace)

我在 grails 目录之外更上一层楼，并创建了项目（工作） -

SandeepanNath:setups sandeepan.nath$ grails create-app new_proj
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/Users/sandeepan.nath/.sdkman/candidates/grails/3.3.10/lib/org.codehaus.groovy/groovy/jars/groovy-2.4.17.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
| Application created at /Users/sandeepan.nath/Desktop/setups/new_proj

并按照https://docs.grails.org/3.3.10/guide/single.html#creatingAnApplication中的步骤创建项目。

现在，当我在 new_proj 中，并尝试运行 grails 命令时，我被阻止在这里 -

SandeepanNath:new_proj sandeepan.nath$ grails
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/Users/sandeepan.nath/.sdkman/candidates/grails/3.3.10/lib/org.codehaus.groovy/groovy/jars/groovy-2.4.17.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
| Error Error initializing classpath: Could not determine java version from '12.0.1'. (Use --stacktrace to see the full trace)

我在环境 PATH 变量中设置了 Java 主页 -

SandeepanNath:~ sandeepan.nath$ echo $PATH
/Users/sandeepan.nath/.sdkman/candidates/grails/current/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/bin:/opt/apache-maven/bin:/usr/libexec/java_home/bin:/opt/apache-maven/bin:/usr/libexec/java_home:/opt/apache-maven/bin

注意 - 没有 /usr/libexec/java_home/bin 这样的路径

不过，当我尝试在我的项目中运行 grails 命令时，我得到了这个 Could not determine java version 错误 -

SandeepanNath:new_proj sandeepan.nath$ grails --stacktrace
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.codehaus.groovy.reflection.CachedClass (file:/Users/sandeepan.nath/.sdkman/candidates/grails/3.3.10/lib/org.codehaus.groovy/groovy/jars/groovy-2.4.17.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.reflection.CachedClass
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
| Error Error initializing classpath: Could not determine java version from '12.0.1'. (NOTE: Stack trace has been filtered. Use --verbose to see entire trace.)
java.lang.IllegalArgumentException: Could not determine java version from '12.0.1'.
    at org.gradle.api.JavaVersion.toVersion(JavaVersion.java:68)
    at org.gradle.api.JavaVersion.current(JavaVersion.java:78)
    at org.gradle.internal.jvm.UnsupportedJavaRuntimeException.assertUsingVersion(UnsupportedJavaRuntimeException.java:29)
    at org.gradle.tooling.internal.consumer.ConnectorServices.checkJavaVersion(ConnectorServices.java:66)
    at org.gradle.tooling.internal.consumer.ConnectorServices.close(ConnectorServices.java:53)
    at org.gradle.tooling.internal.consumer.DefaultGradleConnector.close(DefaultGradleConnector.java:57)
    at org.grails.cli.gradle.cache.CachedGradleOperation.call(CachedGradleOperation.groovy:78)
    at org.grails.cli.GrailsCli.populateContextLoader(GrailsCli.groovy:525)
    at org.grails.cli.GrailsCli.initializeProfile(GrailsCli.groovy:508)
    at org.grails.cli.GrailsCli.initializeApplication(GrailsCli.groovy:306)
    at org.grails.cli.GrailsCli.execute(GrailsCli.groovy:269)
    at org.grails.cli.GrailsCli.main(GrailsCli.groovy:159)

Answer 1

从 Oracle 安装 JDK 8，安装后应该没问题。 Grails 3 需要 7 或 8 个。