Question

下面是我偶然发现的一段代码的最小可验证示例。

package test_package;

import java.util.function.Predicate;

public class TestClass {

  public static final String CONST_STR = " some_data "+ getMoreData(e -> e.getId()==3);

  private static String getMoreData(Predicate<TestEnum> p){
    StringBuilder sb = new StringBuilder();
    for(TestEnum e : TestEnum.values()){
      if(p.test(e)){
        sb.append(e.name());
      }
    }
    return sb.toString();
  }

  public static void main(String[] args) {
    System.out.println(CONST_STR);
  }
}

enum TestEnum{
  OP1(1),OP2(2),OP3(3);

  private final int id;

  public int getId() {
    return id;
  }

  TestEnum(int id){
    this.id = id;
  }
}

当我试图编译它给我的时候

错误：java：java.lang.StackOverflowError

有人能指出我在哪里出错吗？

我在尝试编译javac test_package/TestClass.java

时遇到错误

系统资源不足。请参阅以下堆栈跟踪细节。 java.lang.StackOverflowError at com.sun.tools.javac.code.Scope.dupUnshared（Scope.java:144）at at com.sun.tools.javac.comp.Attr.lambdaEnv（Attr.java:2639）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2305）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）at at com.sun.tools.javac.comp.Attr.attribTree（Attr.java:576）at at com.sun.tools.javac.comp.Attr.visitLambda（Attr.java:2435）at at com.sun.tools.javac.tree.JCTree $ JCLambda.accept（JCTree.java:1624）...

我的版本是javac 1.8.0_112

感谢预期！

Answer 1

It's bug，已在javac-9中修复。我尝试了最新的javac-9，它不会重现。

要解决这个问题：

public static final String CONST_STR;

static {
    CONST_STR = " some_data " + getMoreData(e -> e.getId() == 3);
}

似乎编译得很好......

初始化静态变量时获取StackOverflowError

1 个答案: