从Java9开始,从Scala内部调用java.sql中定义的对象时,如果直接从scala脚本使用,就会抛出java.lang.SecurityException。
Java Version: 10.0.1
Scala Version: 2.12.4
sbt Version: 1.2.0
下面的屏幕截图是一个完整的最小工作示例,其中包含工作版本和非工作版本的控制台输出。具体地说:将脚本代码复制到一个类中,并从该类运行它,解决了这个问题。有没有一种方法可以直接使用java.sql
中的对象来编写Scala脚本
build.sbt
name := "mypackage"
version := "0.1"
scalaVersion := "2.12.4"
libraryDependencies += "org.postgresql" % "postgresql" % "42.2.4"
broken-script.scala
import java.sql.{Connection, DriverManager}
import java.util.Properties
object Main {
private def url = "jdbc:postgresql://localhost:5432/postgres"
val credentials: Properties ={
val properties = new Properties()
properties.setProperty("user", "integration_test")
properties.setProperty("password", "integration-pass")
properties
}
def connect(): Connection =
DriverManager.getConnection(url, credentials)
def run(): Unit = {
connect()
}
}
Main.run()
如下面的控制台输出所示,broken-script.scala
遇到SecurityException。
brokenScript.scala Output
:load scripts/broken-script.scala
Loading scripts/broken-script.scala...
import java.sql.{Connection, DriverManager}
import java.util.Properties
defined object Main
java.lang.securityException: Prohibited package name: java.sql
at java.base/java/lang.ClassLoader.preDefineClass(ClassLoader.java:891)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java 1007)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)
at java.base/java.net.URLClassLoader.defineClass(URLClassLoader.java:545)
at java.base/java.net.URLClassLoader.access$100(URLClassLoader.java:83)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:453)
at java.base/java.net.URLClassLoader$1.run(URLClassLoader.java:447)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/net.URLClassLoader.findClass(URLClassLoader.java:446)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:566)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:553)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at Main$.connect(scripts/broken-script.scala:26)
at Main$.run(scripts/broken-script.scala:30)
src/main/scala/mypackage/Main.scala
package mypackage
import java.sql.{Connection, DriverManager}
import java.util.Properties
object Main {
private def url = "jdbc:postgresql://localhost:5432/postgres"
val credentials: Properties ={
val properties = new Properties()
properties.setProperty("user", "integration_test")
properties.setProperty("password", "integration-pass")
properties
}
def connect(): Connection =
DriverManager.getConnection(url, credentials)
def run(): Unit = {
connect()
}
}
working-script.scala
mypackage.Main.run()
println("Success")
整个项目的图像。
发布于 2018-08-16 21:31:10
正如Rich在评论中指出的,问题在于使用Java9或更高版本的because they changed how classloaders work。不理想的修复方法是降级到Java 8。
要确保安装了Java 8 (Linux):
sudo update-alternatives --display java
要默认使用Java 8:
sudo update-alternatives --config java
在切换到Java 8之后,一切工作正常。这个解决方案并不理想,因为它依赖于使用won't be supported for much longer版本的Java。
https://stackoverflow.com/questions/51790356
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