无法在Mac上的新项目上运行grails命令，因为；无法确定java版本"；错误

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并运行一个“hello world”。我使用sdkman下载并安装了grails。我的安装目录是-

/用户/sandepan.nath/Desktop/setups 在这里，我创建了grails目录并运行了sdk install grails命令，该命令安装了grails并创建了-

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来创建项目，但失败了-

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目录之外再上一层，创建了一个项目（工作）——

并按照中的步骤创建项目

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

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)

我在环境路径变量中设置了Java home-

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，当我尝试在项目中运行

grails

命令时，我发现

无法确定java版本

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)

---

从Oracle安装JDK 8，一旦安装就可以了。Grails3需要7或8

由于错误源于gradle，因此您可能会幸运地得到一个更新的gradle版本。但在过去，我没有这样的运气（用Newes4.xGradle重新加载丢失的代码）。谢谢，我也必须安装gradle。上面的观察是在gradle未安装的情况下进行的。降级JDK后，我必须通过create app创建一个新的应用程序，否则我会出错。@cfrick“…你可能会幸运地得到一个更新的gradle版本”-升级gradle不会解决此问题。它会产生其他问题，并且不会解决这个问题。3.5是Grails3.3.8的推荐Gradle版本。

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)