intellij idea - 错误：java：无效的源版本1.9 [英] intellij idea - Error: java: invalid source release 1.9

问题描述

我正在尝试运行我的JSQL解析器类，但我得到错误：java：无效的源版本1.9 。

我试图关注

代码

  package cs4321.project2; 
 
 import java.io.FileReader; 
 import net.sf.jsqlparser.parser.CCJSqlParser; 
 import net.sf.jsqlparser.statement.Statement; 
 import net.sf.jsqlparser.statement.select.Select; 
 
 public class Parser {
 private static final String queriesFile =resources / input / queries.sql; 
 
 public static void main（String [] args）{
 try {
 CCJSqlParser parser = new CCJSqlParser（new FileReader（queriesFile））; 
声明; 
 while（（statement = parser.Statement（））！= null）{
 System.out.println（Read statement：+ statement）; 
选择select =（Select）语句; 
 System.out.println（Select body is+ select.getSelectBody（））; 
} 
} catch（异常e）{
 System.err.println（解析期间发生异常）; 
 e.printStackTrace（）; 
} 
} 
} 
  

解决方案

选择项目，然后选择文件> ProjectStructure> ProjectSettings>模块 - > sources
您可能将语言级别设置为9：

只需将其更改为8（或您需要的任何内容），即可开始使用。

I'm trying to run my JSQL parser class, but I'm getting Error: java: invalid source release 1.9.

I tried to following this answer. I changed File> Build,Execution,Deployment> Java Compiler> Project bytecode version: 1.8. However, I can't change the Module language level and Project language level to 1.8 because there's not option for that. I still get the same error below.

Error

Code

package cs4321.project2;

import java.io.FileReader;
import net.sf.jsqlparser.parser.CCJSqlParser;
import net.sf.jsqlparser.statement.Statement;
import net.sf.jsqlparser.statement.select.Select;

public class Parser {
    private static final String queriesFile = "resources/input/queries.sql";

    public static void main(String[] args) {
        try {
            CCJSqlParser parser = new CCJSqlParser(new FileReader(queriesFile));
            Statement statement;
            while ((statement = parser.Statement()) != null) {
                System.out.println("Read statement: " + statement);
                Select select = (Select) statement;
                System.out.println("Select body is " + select.getSelectBody());
            }
        } catch (Exception e) {
            System.err.println("Exception occurred during parsing");
            e.printStackTrace();
        }
    }
}

解决方案

Select the project, then File > ProjectStructure > ProjectSettings > Modules -> sources You probably have the Language Level set at 9:

Just change it to 8 (or whatever you need) and you're set to go.

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