在Tomcat 8上部署了我的Java 8 Web应用程序之后,两个类定义如下:
foo.java
package package1;
abstract class Foo {
public String getFoo() {
return "foo";
}
}
bar.java
package package1;
public class Bar extends Foo {
public String getBar() {
return "bar";
}
}
在我的Webapp中,有一段代码可以:
package package2;
public class Something {
...
Bar[] sortedBars = bars.stream()
.sorted(Comparator.comparing(Bar::getBar)
.thenComparing(Bar::getFoo))
.toArray(Bar[]::new);
...
}
当它被执行时,我得到:
java.lang.IllegalAccessError: tried to access class package1.Foo from class package2.Something
我能够避免错误的两种方式:
WebappClassLoader
context: my-web-app
delegate: false
----------> Parent Classloader:
java.net.URLClassLoader@681a9515
用这个简单的POM:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>my.test</groupId>
<artifactId>commons</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
</project>
然后,我进一步简化了某某类,并发现了一些有趣的东西:
package package2;
import java.util.stream.Stream;
import package1.Bar;
public class Something {
public static void main(String[] args) {
System.out.println(new Bar().getFoo());
// "foo"
Stream.of(new Bar()).map(Bar::getFoo).forEach(System.out::println);
// IllegalAccessError
}
}
发布于 2018-03-28 14:08:16
只需从下面的配置切换:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
然后:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<compilerId>eclipse</compilerId>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-compiler-eclipse</artifactId>
<version>2.7</version>
</dependency>
</dependencies>
</plugin>
发布于 2018-03-28 15:24:34
IF包Commons.jar和罐子包装2由另一个类加载器加载,则不同。还有一个解决方案:重写Ba类中的getfoo方法。
https://stackoverflow.com/questions/-100007830
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