What Jersey 2.x library version will solve this issue?-CodePudding

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One of the recommended error fixes uses Jersey 2.x, whereas the project is originally built with Jersey 1.x, and the two are apparently incompatible, if mixed. This is the fundamental cause of the error, and I don't know what versions of Jersey 2.x to use, after trying a bunch without success.

I've updated the pom and web.xml files to reflect Jersey 2.x, which is also the recommended Jersey edition to use.

The pom file looks like this ,and the commented content is Jersey 1.x:

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee <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>CrunchifyRESTJerseyExample</groupId> <artifactId>CrunchifyRESTJerseyExample</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <build>  <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.7.0</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>3.3.1</version> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>asm</groupId> <artifactId>asm</artifactId> <version>3.3.1</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20170516</version> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet-core</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.inject</groupId> <artifactId>jersey-hk2</artifactId> <version>2.26</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-json-jackson</artifactId> <version>2.13</version> </dependency> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-client</artifactId> <version>2.13</version> <scope>provided</scope> </dependency>  <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-core</artifactId> <version>2.3.0.1</version> </dependency> <dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.1</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-impl</artifactId> <version>2.3.1</version> </dependency>  <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> </dependencies> </project>

Some changes from the original:

I said to target version 1.8, not 1.7, as even the guide suggests 1.8, but you can't do it without specifying it in the file. Also, I've added the following dependency due to an error in the pom file:

<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>3.3.1</version> </plugin>

I've also changed the xml content, as the servlet also has to be compliant with a Jersey version. Commented out is the version for Jersey 1.x

<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>CrunchifyRESTJerseyExample</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>Jersey REST Service</servlet-name> <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class> <init-param> <param-name>jersey.config.server.provider.packages</param-name> <param-value>com.crunchify.restjersey</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet>  <servlet-mapping> <servlet-name>Jersey Web Application</servlet-name> <url-pattern>/crunchify/*</url-pattern> </servlet-mapping> </web-app>

Running the project on its own yields the following:

I have further tried a suggestion out of the comments on the project for a 2020 version of Eclipse, to no avail.

I've reviewed a number of similar questions, including the comments under the example. This is just a selection of what I've looked up so far:

started the server, and it worked immediately:

Jersey and ASM versions

You are using super old software versions, e.g. Jersey 2.13 is so old that it is not even contained in the Eclipse Jersey GitHub repository which started 2018 with a first release 2.28-RC1. In order to find the archived legacy GlassFish Jersey repository, I had to look around first.

Anyway, Jersey 2.13, the version you selected for your project, internally uses ASM 5.0.2 according to the POM. I see ASM 3.3.1 in your own POM, which according to the ASM release notes does not even support Java 7 fully yet. Yet you are compiling to Java 8 byte code version according to your Maven Compiler settings. So whatever ASM does in your project, you want to use at least a version supporting Java 8. That would be at least ASM 5.0, so I recommend to stick with the version used by Jersey, 5.0.2.

But that does not fix your problem. The stack trace actually says there is a problem in jersey.repackaged.org.objectweb.asm.ClassReader, i.e. in an ASM class packaged and relocated into Jersey itself. It is not using the old version you specified in your POM. I could not reproduce your problem here locally. I just wanted to mention that.

Optimise the POM

Later, I used mvn dependency:analyze in order to find out which dependencies you are actually using. ASM is unused in your servlet, like I said. So you can remove it. You only need Jersey, JSON and Jakarta WS-RS API, which is a transitive dependency of one of the Jersey libraries, but you should still reference it in your POM, if you access its classes. Relying on transitive dependencies is not the clean Maven way. I also upgraded the plugins you use and JSON dependency, then removed everything unused. The new POM looks like this:

<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> <groupId>CrunchifyRESTJerseyExample</groupId> <artifactId>CrunchifyRESTJerseyExample</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <build> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.10.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.3.2</version> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20220320</version> </dependency> <dependency> <groupId>jakarta.ws.rs</groupId> <artifactId>jakarta.ws.rs-api</artifactId> <version>2.1.6</version> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet</artifactId> <version>2.35</version> </dependency> <dependency> <groupId>org.glassfish.jersey.inject</groupId> <artifactId>jersey-hk2</artifactId> <version>2.35</version> </dependency> <dependency> <groupId>org.glassfish.jersey.media</groupId> <artifactId>jersey-media-json-jackson</artifactId> <version>2.35</version> </dependency> </dependencies> </project>

GitHub pull request

https://github.com/username917/Temerature-Converter-Challenge/pull/2