on adding spring-data-rest-hal-browser dependency to my spring boot application(v 2.2.4) -my app failed to start .how to fix it? - spring-boot

Hi I am new to spring boot.
spring-boot-starter-actuator it works fine in the http://localhost:8080/actuator.
my spring boot version is 2.2.4
on adding
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-hal-browser</artifactId>
</dependency>
application failed to start .
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.data.rest.core.support.UnwrappingRepositoryInvokerFactory.<init>(UnwrappingRepositoryInvokerFactory.java:57)
The following method did not exist:
org.springframework.plugin.core.PluginRegistry.of(Ljava/util/List;)Lorg/springframework/plugin/core/PluginRegistry;
The method's class, org.springframework.plugin.core.PluginRegistry, is available from the following locations:enter code here
jar:file:/C:/Users/SATHISH%20S/.m2/repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/spring-plugin-core-1.2.0.RELEASE.jar!/org/springframework/plugin/core/PluginRegistry.class
It was loaded from the following location:
file:/C:/Users/SATHISH%20S/.m2/repository/org/springframework/plugin/spring-plugin-core/1.2.0.RELEASE/spring-plugin-core-1.2.0.RELEASE.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.springframework.plugin.core.PluginRegistry
and my pom.xml is
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.4.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.springboot</groupId>
<artifactId>MysqlCrud</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>MysqlCrud</name>
<description>Demo project for Spring Boot mysql crud</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-rest-hal-browser -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-hal-browser</artifactId>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
help me to fix this.
Thank you

Spring Fox 2.9 is only compatible with version 1.2 of spring-plugin-core whereas the version of Spring Data REST included in Spring Boot 2.2 requires 2.0. Until a compatible version of SpringFox is released, you have a few options:
remove SpringFox from your app
remove Spring Data REST from your app
downgrade to Spring Boot 2.1.x

To run with latest version of Spring boot, add the below dependency,
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-rest-hal-explorer</artifactId>
</dependency>

Related

exception in loading bean in Springboot application

We are trying to convert a standalone spring-hibernate based application to web application using Springboot(STS 4). We are using applicationcontext.xml file for bean creation and configuration.We configured libraries in pom.xml,which is attached here. When running the application using Maven, following error is showing. Please help
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findPersistenceMetadata(PersistenceAnnotationBeanPostProcessor.java:350)
The following method did not exist:
org.springframework.beans.factory.annotation.InjectionMetadata.<init>(Ljava/lang/Class;)V
The calling method's class, org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor, was loaded from the following location:
jar:file:/C:/Users/CIG-Lekshmi1/.m2/repository/org/springframework/spring-orm/2.5.6/spring-orm-2.5.6.jar!/org/springframework/orm/jpa/support/PersistenceAnnotationBeanPostProcessor.class
The called method's class, org.springframework.beans.factory.annotation.InjectionMetadata, is available from the following locations:
jar:file:/C:/Users/CIG-Lekshmi1/.m2/repository/org/springframework/spring-beans/5.3.16/spring-beans-5.3.16.jar!/org/springframework/beans/factory/annotation/InjectionMetadata.class
The called method's class hierarchy was loaded from the following locations:
org.springframework.beans.factory.annotation.InjectionMetadata: file:/C:/Users/CIG-Lekshmi1/.m2/repository/org/springframework/spring-beans/5.3.16/spring-beans-5.3.16.jar
Action:
Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor and org.springframework.beans.factory.annotation.InjectionMetadata
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.6.4</version>
<relativePath/>
</parent>
<groupId>com.example</groupId>
<artifactId>ProveWeb-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ProveWeb-2</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jdbc</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-jdbc</artifactId> -->
<!-- </dependency> -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>com.opencsv</groupId>
<artifactId>opencsv</artifactId>
<version>5.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.10</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<dependency>
<groupId>com.toedter</groupId>
<artifactId>jcalendar</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.3.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

NoSuchMethodError: org.springframework.plugin.core.PluginRegistry.getPluginOrDefaultFor

Everything was fine, even with Swagger however suddenly after new build project won't compile throwing
Caused by: org.springframework.context.ApplicationContextException: Failed to start bean 'documentationPluginsBootstrapper'; nested exception is java.lang.NoSuchMethodError: org.springframework.plugin.core.PluginRegistry.getPluginOrDefaultFor(Ljava/lang/Object;Lorg/springframework/plugin/core/Plugin;)Lorg/springframework/plugin/core/Plugin;
I have tried solution from this link:
https://github.com/springfox/springfox/issues/2932
however compilation error still persist.
I am attaching 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.geborskimateusz.microservices.composite.movie</groupId>
<artifactId>movie-composite-service</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>movie-composite-service</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<swagger.version>3.0.0-SNAPSHOT</swagger.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.geborskimateusz</groupId>
<artifactId>api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.geborskimateusz</groupId>
<artifactId>util</artifactId>
<version>0.0.1-SNAPSHOT</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>5.1.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${swagger.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-spring-webflux</artifactId>
<version>${swagger.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${swagger.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-rabbit</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-stream-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-stream-test-support</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Greenwich.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<repositories>
<repository>
<id>jcenter-snapshots</id>
<name>jcenter</name>
<url>http://oss.jfrog.org/artifactory/oss-snapshot-local/</url>
</repository>
</repositories>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Any ideas, is this related to swagger version?
This error happens when a piece of code has been compiled with a given method signature, but at runtime, another is found.
This usually happens when there's a difference between the version of a dependency used at compile time, and the dependency that is actually provided to the program at runtime.
We just had this error as well with a colleague, and we fixed it by simply changing the spring boot version to 2.2.2.
Not sure what exactly happened, but given the version is a SNAPSHOT, a wild guess would be that the last working version of springfox (working for you and us) was compiled with a Spring boot version inferior to 2.2.2.
That boot version had a different method signature for getPluginOrDefaultFor (or possibly the method didn't exist at all).
Your program sees no difference, because the swagger lib's API didn't change, so
it seems like nothing changed and there's suddenly an error.
But the actual swagger lib's underlying implementation relies on some method from Spring Boot 2.2.2, which it doesn't find in your setup since Boot's version is 2.1.0, and this generates a conflict between what it expects to find and what it actually does.
Anyway, just upgrading your Boot to 2.2.2 should fix it ; possibly downgrading spring-fox to 2.9.2 if you don't need the webflux module- but it seems you do (didn't get the chance to try, because in our case we do need the springfox webflux dependency)

Whitelabel Error page, Type:Not Found Status:404

We recently upgraded our spring boot version from 1.5.10 to 2.1.2 and I'm facing an issue. When the service is deployed on j boss server, it says service Not found and throws an error of White label error page when I call the service in the swagger by https://host:port/serviceName/swagger-ui.html but if i call https://host:port/swagger-ui.html I could access the service and everything works fine. Can some one let me know what will be the issue. Appreciated for the help.
There is nothing change in the pom.xml or bootstrap.yml, I have just upgraded the spring boot versions. Everything else is same as previous.
Below is the POM.Xml
<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.goo.foo</groupId>
<artifactId>security-service</artifactId>
<version>1.2.3</version>
<properties>
<dep.scope>compile</dep.scope>
<java.version>1.8</java.version>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<ojdbc.version>12.1.0.2</ojdbc.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<springfox-version>2.6.1</springfox-version>
<config.version>2.1.0.RELEASE</config.version>
<admin.version>2.1.0</admin.version>
<consul-starter.version>2.1.0.RELEASE</consul-starter.version>
<cloud-consul.version>2.1.0.RELEASE</cloud-consul.version>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.2.RELEASE</version>
<relativePath />
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-consul-dependencies</artifactId>
<version>${cloud-consul.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!--SpringFox dependencies -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox-version}</version>
<scope>${dep.scope}</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox-version}</version>
<scope>${dep.scope}</scope>
</dependency>
<dependency>
<groupId>org.owasp.esapi</groupId>
<artifactId>esapi</artifactId>
<version>2.1.0</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.7.0</version>
</dependency>
<!-- Oracle JDBC driver -->
<dependency>
<groupId>com.oracle.jdbc</groupId>
<artifactId>ojdbc7</artifactId>
<version>${ojdbc.version}</version>
<scope>${dep.scope}</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
</dependency>
<!-- Consul properties -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-all</artifactId>
<version>${consul-starter.version}</version>
</dependency>
<!-- Spring config server - external properties -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-client</artifactId>
<version>${config.version}</version>
</dependency>
<!-- Spring boot admin client - monitoring the purpose -->
<dependency>
<groupId>de.codecentric</groupId>
<artifactId>spring-boot-admin-starter-client</artifactId>
<version>${admin.version}</version>
</dependency>
<!-- jedis cache -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Seems like you "lost" your context-path. I guess you previously specified it using the now deprecated server.contextPath=/serviceName in some form. There are several ways to set it, but the way I do it is configuring it in the application.yaml
server:
servlet:
context-path: serviceName
or application.properties
server.servlet.context-path=/serviceName
or you could set the context-path by specifying it as a command line argument
java -jar app.jar --server.servlet.context-path=/serviceName
This is just some of the options available. Figure out how you set it before and replace that with server.servlet.context-path

How to verify a Spring feature/Bug fix is available in the Spring boot version which i am using?

I am working on a spring batch program to process data from sql and write to an xml. I used staxEventItemWriter to do that. But due to this issue https://jira.spring.io/browse/BATCH-1377 i am not able to fix the namespace issue. When we look at comments on this Jira card it says its fixed in 2010. But its not available in the latest spring boot versions which i am using. i tried with the patch class described in the Jira card its working fine for me.
<?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.demo.sitemap</groupId>
<artifactId>SqlToXml</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SqlToXml</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</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>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-batch</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-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.batch</groupId>
<artifactId>spring-batch-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>6.1.0.jre8</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-oxm -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>3.0.6.RELEASE</version>
</dependency>
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.10</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.0.4.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
How to verify a Spring feature/Bug fix is available in the Spring boot version which i am using?
You are using Spring Boot 2.0.4.RELEASE. This will bring Spring Batch version 4.0.1.RELEASE. You can find more details about dependencies using the Spring Boot Initializr REST API.
The issue BATCH-1377 is marked as resolved in version 2.1.0.RC1 and is also available in 4.0.1.RELEASE.
But its not available in the latest spring boot versions which i am using. i tried with the patch class described in the Jira card its working fine for me.
The patch suggested by the contributor uses an additional property rootTagNamePrefix but this was modified as per this comment to use the naming convention {uri}prefix:root in order to be consistent with Spring WS. The issue was fixed here: https://github.com/spring-projects/spring-batch/commit/f56ee747296961917caa38fa9e14785dafc0b18b
So in your case, you need to use this naming convention if you want to add a namespace to the root tag. See example here: https://github.com/spring-projects/spring-batch/blob/f56ee747296961917caa38fa9e14785dafc0b18b/spring-batch-infrastructure/src/test/java/org/springframework/batch/item/xml/StaxEventItemWriterTests.java#L287

Spring Boot with non-embedded Tomcat: loader constraint violation error

I have an error when trying to display a JSP with Spring Boot. Here is my configuration:
Spring source STS (last version)
Spring Boot 1.1.8 (last release to date)
Java 1.7
Tomcat 8.0.14 (I'm not using the embedded tomcat, so I launch manually with the spring boot application added)
My JSP file is barebones:
TEST
Here is my 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.edhec</groupId>
<artifactId>stdapps</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>stdapps</name>
<description>Project stdapps</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.1.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</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-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-c3p0</artifactId>
<version>4.3.6.Final</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc14</artifactId>
<version>10.2.0.4.0</version>
</dependency>
<!-- CAS Client -->
<dependency>
<groupId>org.jasig.cas.client</groupId>
<artifactId>cas-client-core</artifactId>
<version>3.3.3</version>
<scope>runtime</scope>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-cas</artifactId>
<type>jar</type>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-taglibs</artifactId>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.3.2</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<start-class>com.edhec.stdapps.Application</start-class>
<java.version>1.7</java.version>
<tomcat.version>8.0.14</tomcat.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
Here is the error I get :
java.lang.LinkageError: loader constraint violation: when resolving method "org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/WEB_002dINF/views/agreement2/index_jsp, and the class loader (instance of java/net/URLClassLoader) for resolved class, org/apache/jasper/runtime/InstanceManagerFactory, have different Class objects for the type .getInstanceManager(Ljavax/servlet/ServletConfig;)Lorg/apache/tomcat/InstanceManager; used in the signature
I think it has a relation with el or jsp-api version, I try to add manually in the pom.xml but got same error or sometimes 'noClassDefFoundError on my compiled jsp'
Does someone see what's going wrong?
Due to your dependency on spring-boot-starter-web and spring-boot-starter-websocket and their transitive dependencies, you're packaging Tomcat inside your war file. This is leading to there being two different versions of Tomcat's classes available and is caused the constraint violation. You need to mark the Tomcat dependencies as provided so that they don't get packaged in WEB-INF/lib.
Add the following dependencies to your pom:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-websocket</artifactId>
<scope>provided</scope>
</dependency>
It's preferable to mark the dependencies as provided, rather than excluding them altogether, as it allows your war file to be deployed to Tomcat or executed with java -jar. This works because the provided dependencies are packaged in WEB-INF/lib-provided where they'll be ignored by a standalone Servlet container but be available when you're using the embedded container.
In gradle I added this line to dependencies:
dependencies {
...
providedRuntime('org.springframework.boot:spring-boot-starter-tomcat')
...
}

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