CODEWITHSUNDEEP
javamavenintellij-idea
user13702612
user13702612

Reputation:

Maven project compile error: cannot find symbol (which is java.lang.String)

It's a very simple web scraping program that I built in intellij idea with the maven build system. It worked fine before today but when I tried to build it today it gave me object not found errors for base java objects like String and List. When I tried to reload the maven project I got another error below. Idea also highlights the basic java object in red and gives no advice. The only thing I did was slightly modify the java source code. So, I tested with the stock hello world code. It did compile and run, but Intellij still highlights String and System in red and the maven reload produces the same error. Help is greatly appreciated as I need to get some data for a research project.

Error with web scraping source code compilation error

Error:(24, 13) java: cannot find symbol
  symbol:   class List
  location: class Main

Maven reload error

Cannot resolve plugin org.apache.maven.plugins:maven-compiler-plugin:${maven.compiler.version}

This is the pom.xml file

<?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>

    <groupId>org.example</groupId>
    <artifactId>htmlunittest</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>net.sourceforge.htmlunit</groupId>
            <artifactId>htmlunit</artifactId>
            <version>2.19</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.7.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven.compiler.version}</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

Upvotes: 2

Views: 14332

Answers (1)

Abhinaba Chakraborty
Abhinaba Chakraborty

Reputation: 3671

Update:

After resolving the maven errors, since you are facing IDE related problems, I would suggest you to do this:

  1. Go to File > Project Structure

IntelliJ1

  1. Add the JDK in Project SDK (If it is not there, under Platform Settings > SDKs, you need to add the JDK)

IntelliJ2

  1. Also ensure that maven home is set correctly in Preferences > build tools > maven: IntelliJ3

  2. Then do a maven rebuild from the side panel: IntelliJ4

You have forgot to define the property ${maven.compiler.version} in your POM.

Define a properties section in your POM like this:

  <properties>
    <java.version>1.11</java.version>
    <maven.compiler.version>3.8.1</maven.compiler.version>
  </properties>

Upvotes: 3

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