Why am I getting Unknown error in line 1 of pom.xml?

java maven spring-boot pom.xml

138,542

Solution 1

answer according to current status

Please install the m2e connector for mavenarchiver plugin 0.17.3 from https://download.eclipse.org/m2e-wtp/releases/1.4/

obsolete answer

A less profound change than a downgrade from Spring Boot 2.1.5.RELEASE to 2.1.4.RELEASE would be downgrading only the affected Maven JAR Plugin from 3.1.2 to 3.1.1 as long as this bug exists:

<properties>
    <!-- ... -->
    <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>

Solution 2

Add 3.1.1 in to properties like below than fix issue

<properties>
        <java.version>1.8</java.version>
        <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>
</properties>

Just Update Project => right click => Maven=> Update Project

Solution 3

For me I changed in the parent tag of the pom.xml and it solved it change 2.1.5 to 2.1.4 then Maven-> Update Project

Solution 4

As per the suggestion from @Shravani, in my pom.xml file, I changed my version number in the area from this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.5.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

to this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

I then right clicked on the project and did a 'Maven -> Update project...'. This made the problem go away for me.

Solution 5

There is a bug about Eclipse and spring-boot-starter-parent 2.1.5

"if the maven packaging attribute is war then no problem.The problem is in jar type." So you can also fix this problem by changing packaging type.

<packaging>war</packaging>

View more solutions

138,542

Author by

Shravani

Updated on July 08, 2022

Comments

Shravani almost 2 years

Getting unknown error at Line 1 in pom.xml in Eclipse IDE. It was working fine till yesterday, but all of a sudden after updating my project from master and after fixing merge conflicts getting "Unknown error" in pom.xml. Except me, none of my teammates are facing this issue. I also changed the workspace, deleted cache but still no luck.

I am using the h2 database for this project, in spite of inserting values in data.sql, it is not picking up any values and inserting into h2 DB tables. Before this issue, it was working fine. I feel its due to the issue in pom.xml, I am not sure though. Please help

I deleted the existing project and took the latest code from master. After that deleted .m2 folder under users including the repository folder. I did update project and enabled Forced update of snapshots/releases, maven clean and maven build. But nothing helps.

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>

    <groupId>com.abc.roster</groupId>
    <artifactId>spring-boot-roster-app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>spring-boot-roster-app</name>
    <description>Demo project for Spring Boot Roster</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.BUILD-SNAPSHOT</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <!-- <start-class>com.infosys.roster.SpringBootRosterAppApplication</start-class> -->
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <!--encryption lib -->
        <dependency>
            <groupId>org.jasypt</groupId>
            <artifactId>jasypt</artifactId>
            <version>1.9.2</version>
        </dependency>

        <dependency>
            <groupId>org.jasypt</groupId>
            <artifactId>jasypt-springsecurity3</artifactId>
            <version>1.9.0</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>

        </dependency>


<!--        <dependency> -->
<!--         <groupId>org.hibernate</groupId> -->
<!--         <artifactId>hibernate-core</artifactId> -->
<!--         <version>5.2.10.Final</version> -->
<!--   </dependency> -->

        <!-- <dependency> -->
        <!-- <groupId>io.springfox</groupId> -->
        <!-- <artifactId>springfox-swagger2</artifactId> -->
        <!-- <version>2.7.0</version> -->
        <!-- <scope>compile</scope> -->
        <!-- </dependency> -->


        <!-- <dependency> -->
        <!-- <groupId>io.springfox</groupId> -->
        <!-- <artifactId>springfox-swagger-ui</artifactId> -->
        <!-- <version>2.7.0</version> -->
        <!-- <scope>compile</scope> -->
        <!-- </dependency> -->

        <!-- <dependency> -->
        <!-- <groupId>io.springfox</groupId> -->
        <!-- <artifactId>springfox-data-rest</artifactId> -->
        <!-- <version>2.7.0</version> -->
        <!-- </dependency> -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
    </pluginRepositories>

</project>

application.properties

server.port=
spring.h2.console.path=/h2
spring.h2.console.enabled=true

spring.datasource.url=


spring.datasource.username=
spring.datasource.password=
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.platform=h2
spring.datasource.initialization-mode=always

spring.jpa.hibernate.ddl-auto=update
spring.datasource.continue-on-error=true

spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=false

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.H2Dialect

Should remove unknown error in pom.xml and also I must be able to populate values in H2 db.

light_303 almost 5 years

same here! still not sure what in the spring parent pom causes this problem since 2.1.5
Shravani almost 5 years

@fsuwailih Thanks this one worked. But I am wondering why is it only working for some people but not for others.
Shravani almost 5 years

After changing the version for parent tag it worked magically
John Eipe almost 5 years

this did it for me
Miklos Krivan almost 5 years

The newest Eclipse (2019-03) has the same problem. Changing the maven-jar-plugin from 3.1.2 to 3.1.1 based on your suggestion solved the issue. Many thanks.
Del Pedro almost 5 years

obsolete answer was the solution that worked for me
Matthias almost 5 years

Just for the record, my problem was solved by upgrading the mavenarchiver plugin.
Arijit Basu almost 5 years

This solution actually worked! I changed it to 2.1.4 from 2.1.6. But why the later versions are causing that error?
ASharma7 almost 5 years

after installing m2e connector for mavenarchiver plugin, restart maven & do maven -->update project-->force update of snapshots
PatVictorio over 4 years

I meant 2.1.4.RELEASE.
rich p over 4 years

I found these instructions the clearest path to implementing the solution that everyone says is the root cause problem, the need to upgrade this connector. Also, it worked. :^)
Ehsan Waris over 4 years

installing the latest m2e connector for mavenarchiver fixed it for me
PatVictorio over 4 years

Edited my answer and fixed the typo.
nix86 about 4 years

Yes. Inside properties you must have <maven-jar-plugin.version>3.1.1</maven-jar-plugin.version>. Then you right click on the project in the project explorer and choose "Maven -> Update Project..."
Jafar Karuthedath almost 4 years

Issue solved after installing the m2e connector. Thank you.
Jean-Christophe almost 4 years

This issue seems to appear from maven-jar-plugin 3.1.2 & 3.2.0.
Sadina Khatun over 3 years

yes but 3.1.1 is working fine so we can use that one
manish bansal almost 3 years

Issue solved after installing the m2e connector. You saved my day.. Thanks :)
iifast about 2 years

Really Helpful ! I added that below the java version <java.version>1.8</java.version> and updated the project and did refresh on STS, It worked like a charm
Shashi Ranjan about 2 years

The only correct answer.
cogitoboy about 2 years

3.2.2 Still showing the error. 3.1.1 is the latest that works for me without the error.