当我试图通过IntelliJ中的stream调试下面代码中的流时,调试器无法计算foreach,因为下面的错误是抛出的。我不知道它是关于什么的,代码本身运行良好。
完全更新的IntelliJ社区版本,JUnit 5,Spring,Maven,Java11。
仅在流跟踪调试期间发生的错误:
com.progonkpa.file.FileService$GeneratedEvaluationClass$5类型不是com.progonkpa.file.FileService的嵌套成员:类型在不同的包中
包含流的代码:
public class FileService {
public void createDirs(File parentDir, String[] fileNames) {
Stream.of(fileNames)
.map(fileName -> new File(parentDir, fileName))
.forEach(file -> {
if (file.mkdirs())
System.out.println("Created file: " + file);
else
System.err.println("Failed to create file: " + file);
});
}
}调用上述方法的测试:
public class FileServiceTest {
private FileService fileService = new FileService();
@Test
public void generateDirs_createsList() {
File tmpDir = new File("/tmp");
String[] dirNamesList = {"dir1", "dir2"};
File createdDir1 = new File(tmpDir, dirNamesList[0]);
File createdDir2 = new File(tmpDir, dirNamesList[1]);
fileService.createDirs(tmpDir, dirNamesList);
assertTrue(createdDir1.exists());
assertTrue(createdDir2.exists());
assertTrue(createdDir1.delete());
assertTrue(createdDir2.delete());
assertTrue(tmpDir.delete());
}
}pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.unknown.somefunction</groupId>
<artifactId>joske</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!--<dependency>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-starter-test</artifactId>-->
<!--<scope>test</scope>-->
<!--</dependency>-->
<!--Data processing-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-csv</artifactId>
<version>1.6</version>
</dependency>
<dependency>
<groupId>org.simplejavamail</groupId>
<artifactId>simple-java-mail</artifactId>
<version>5.1.3</version>
</dependency>
<dependency>
<groupId>org.simplejavamail</groupId>
<artifactId>outlook-message-parser</artifactId>
<version>1.1.17</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>com.github.vatbub</groupId>
<artifactId>mslinks</artifactId>
<version>1.0.5</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.3.2</version>
<scope>test</scope>
</dependency>
<!--Testing-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

发布于 2019-03-23 14:39:12
显然,Stream调试器生成字节码,并动态定义类来计算表达式。相关源文件为
在YouTrack上有一个当前尚未解决的问题,除了完全相同的例外
Type some.Type$GeneratedEvaluationClass$1 is not a nest member of some.Type: types are in different packages这只显示在大于10的JDK版本上,不幸的是,您有
<java.version>11</java.version>正如问题所表明的那样,它的发生是因为
JDK 11具有“基于巢的访问控制”功能。 (https://cr.openjdk.java.net/~dlsmith/nestmates.html)
9月181说
对其他工具的影响 任何在类文件上操作、生成或处理字节码的工具都可能受到这些更改的影响。至少,此类工具必须容忍新的类文件属性的存在,并允许字节码规则的更改。例如: javap检查工具、Pack200实现和ASM字节码操作框架(也在JDK内部使用)。
https://stackoverflow.com/questions/55314726
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