[Looking在records
构建中使用Java 14中的gradle
,但正在获取:
thufir@dur:~/NetBeansProjects/FileWatcherHandler$
thufir@dur:~/NetBeansProjects/FileWatcherHandler$ gradle clean build
> Task :compileJava FAILED
/home/thufir/NetBeansProjects/FileWatcherHandler/src/main/java/net/bounceme/dur/files/FXOrder.java:3: error: records are a preview feature and are disabled by default.
public record FXOrder(int units) {}
^
(use --enable-preview to enable records)
1 error
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 641ms
2 actionable tasks: 1 executed, 1 up-to-date
thufir@dur:~/NetBeansProjects/FileWatcherHandler$
用javac
编译看起来不错:
thufir@dur:~/java$
thufir@dur:~/java$ ls
FXOrder.java
thufir@dur:~/java$
thufir@dur:~/java$ cat FXOrder.java
public record FXOrder(int units) {}
thufir@dur:~/java$
thufir@dur:~/java$ javac --enable-preview -source 14 FXOrder.java
Note: FXOrder.java uses preview language features.
Note: Recompile with -Xlint:preview for details.
thufir@dur:~/java$
thufir@dur:~/java$ ls
FXOrder.class FXOrder.java
thufir@dur:~/java$
如何在以下构建文件中设置那些编译选项:
/*
* This file was generated by the Gradle 'init' task.
*
* This generated file contains a sample Java project to get you started.
* For more details take a look at the Java Quickstart chapter in the Gradle
* User Manual available at https://docs.gradle.org/6.4.1/userguide/tutorial_java_projects.html
*/
plugins {
// Apply the java plugin to add support for Java
id 'java'
// Apply the application plugin to add support for building a CLI application.
id 'application'
}
repositories {
// Use jcenter for resolving dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
}
dependencies {
// This dependency is used by the application.
implementation 'com.google.guava:guava:28.2-jre'
// Use TestNG framework, also requires calling test.useTestNG() below
testImplementation 'org.testng:testng:7.1.1'
}
application {
// Define the main class for the application.
// mainClassName = 'FileWatcherHandler.App'
mainClassName = 'net.bounceme.dur.files.App'
}
test {
// Use TestNG for unit tests
useTestNG()
}
java版本:
thufir@dur:~/java$
thufir@dur:~/java$ gradle --version
------------------------------------------------------------
Gradle 6.4.1
------------------------------------------------------------
Build time: 2020-05-15 19:43:40 UTC
Revision: 1a04183c502614b5c80e33d603074e0b4a2777c5
Kotlin: 1.3.71
Groovy: 2.5.10
Ant: Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM: 14.0.1 (AdoptOpenJDK 14.0.1+7)
OS: Linux 5.4.0-29-generic amd64
thufir@dur:~/java$
thufir@dur:~/java$ java --version
openjdk 14.0.1 2020-04-14
OpenJDK Runtime Environment AdoptOpenJDK (build 14.0.1+7)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 14.0.1+7, mixed mode, sharing)
thufir@dur:~/java$
thufir@dur:~/java$ javac --version
javac 14.0.1
thufir@dur:~/java$
thufir@dur:~/java$ which java
/home/thufir/.sdkman/candidates/java/current/bin/java
thufir@dur:~/java$
compileJava
任务并添加此标志。将此添加到您的build.gradle
:compileJava {
options.compilerArgs += ['--enable-preview']
}
这将确保您的代码将被编译。
但是您还必须确保为将运行您的代码的JVM添加此标志:
tasks.withType(JavaExec) { jvmArgs += '--enable-preview' }
这在相应的JEP中进行了描述:希望在程序中使用预览语言功能的开发人员必须在编译器和运行时系统中明确启用它们
build.gradle
文件:compileJava {
options.warnings = false
options.deprecation = false
options.compilerArgs += ["-Xdoclint:none", "-Xlint:none", "-nowarn"]
options.compilerArgs += ["-Xlint"]
options.compilerArgs += ["--enable-preview"]
options.compilerArgs += ["-source 14"]
// options.compilerArgs << "-Xlint:unchecked" << "-Xlint:deprecation"
}
此外,还需要运行选项:tasks.withType(JavaExec){jvmArgs + ='-启用预览'}
可能已解决,或者至少在我认为正确的轨道上。