Multi line string in Java 17

Question

I am using multi line strings in java 17.0.2 but have been recieving the following error

        String test = """
        {
            "deploymentResourceId": "deployment"
        }
        """;

Error:

/sparta/input/PackageResource.java:262:25: expecting SEMI, found '"
        {
            "'

2023-10-17 23:31:16.027 UTC [ERROR] Failed to execute goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check (verify-style-1) on project : Execution verify-style-1 of goal org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check failed: begin 1253, end 18, length 18 -> [Help 1]

Using string builder works fine but i want to use multi line strings

The error message is not from the Java Compiler but from the checkstyle plugin / from checkstyle. It could be that you are using an old version of the checkstyle plugin (your version is 2.17, the current version is 3.3.0) and / or an old version of checkstyle itself that doesn't yet support the multiline strings that have been added to Java 17. The fix would be to upgrade the checkstyle plugin and the checkstyle version. — Thomas Kläger
– Thomas Kläger, Commented Oct 18, 2023 at 17:32
@OHGODSPIDERS Java has support for multiline strings since around Java 15 (stackoverflow.com/questions/878573/…) and the OPs code is valid Java code for Java 17. — Thomas Kläger
– Thomas Kläger, Commented Oct 18, 2023 at 17:34
According to github.com/checkstyle/checkstyle/issues/9111 you need at least CheckStyle version 8.36 (and a version of the CheckStyle plugin that supports CheckStyle 8.36) — Thomas Kläger
– Thomas Kläger, Commented Oct 18, 2023 at 17:40
The close as duplicate isn't correct - an unescaped quote is valid in multi-line declaration, its just that checkstyle isn't up to date. — DuncG
– DuncG, Commented Oct 18, 2023 at 18:11
@ThomasKläger your comments would form the basis of a good answer. Hint, hint. — David Conrad
– David Conrad, Commented Oct 18, 2023 at 18:18

Basil Bourque · Accepted Answer · 2023-10-18 20:24:33Z

2

The error message is produced by an outdated version of CheckStyle.

According to the CheckStyle ticket Support for Java 15 Strings you need at least CheckStyle version 8.36 if you want to use text blocks / multiline strings together with CheckStyle checks.

The error message (org.apache.maven.plugins:maven-checkstyle-plugin:2.17:check) indicates that your project uses the Maven-CheckStyle-Plugin version 2.17 which according to Maven Checkstyle Plugin Releases History by default uses CheckStyle version 6.11.2

You can try to configure your project to use the Maven CheckStyle Plugin 2.17 together with the CheckStyle version 8.36 using the following configuration (source: Upgrading Checkstyle at Runtime):

<project>
  ...
  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-checkstyle-plugin</artifactId>
          <version>2.17</version>
          <dependencies>
            <dependency>
              <groupId>com.puppycrawl.tools</groupId>
              <artifactId>checkstyle</artifactId>
              <version>8.36</version>
            </dependency>
          </dependencies>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
  ...
</project>

edited Oct 18, 2023 at 20:24

Basil Bourque

347k130 gold badges950 silver badges1.3k bronze badges

answered Oct 18, 2023 at 18:54

Thomas Kläger

22k3 gold badges31 silver badges40 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

pirateking Over a year ago

Thanks, that resolved my issue . I am trying to update my text block as below to include some variables

String test = """         {             "deploymentResourceId": "%s"         }         """.formatted(deploymentResourceId);

but the variable is not getting replaced in the json. do you know how to resolve this? i also tried

pirateking Over a year ago

I also tried String test = """ { "deploymentResourceId": "$deploymentResourceId" } """;

Holger Over a year ago

@pirateking you should open a new question for your new problem.

Diego Borba · Accepted Answer · 2023-10-20 11:55:28Z

0

Upgrading the maven-checkstyle-plugin and checkstyle resolved the issue:

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-checkstyle-plugin</artifactId>
  <version>3.3.0</version>
  <dependencies>
    <dependency>
      <groupId>com.puppycrawl.tools</groupId>
      <artifactId>checkstyle</artifactId>
      <version>10.12.1</version>
    </dependency>
  </dependencies>
</plugin>

edited Oct 20, 2023 at 11:55

Diego Borba

2,4356 gold badges15 silver badges29 bronze badges

answered Oct 19, 2023 at 21:23

pirateking

131 silver badge3 bronze badges

Collectives™ on Stack Overflow

Multi line string in Java 17

2 Answers 2

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related