A child container failed during start java.util.concurrent.ExecutionException [duplicate]

Answer 1

check if you JAVA_HOME is set to 1.7 or below. because tomcat 7 is not compatible with jdk 1.8

This worked for me

Answer 2

I faced similar issue and it was caused because I had written WebServlet Path in the .java file as well as in the web.xml . Removing it from any one location works fine for me.

In the .java file

@WebServlet("/index1.jsp")

and in web.xml

<servlet>
    <servlet-name>Logout</servlet-name>
    <servlet-class>tpc.Logout</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Logout</servlet-name>
    <url-pattern>/index1.jsp</url-pattern>
</servlet-mapping>

Answer 3

Your webapp has servletcontainer specific libraries like servlet-api.jar file in its /WEB-INF/lib. This is not right.

Remove them all.

The /WEB-INF/lib should contain only the libraries specific to the webapp, not to the servletcontainer. The servletcontainer (like Tomcat) is the one who should already provide the servletcontainer specific libraries.

If you supply libraries from an arbitrary servletcontainer of a different make/version, you'll run into this kind of problems because your webapp wouldn't be able to run on a servletcontainer of a different make/version than where those libraries are originated from.

How to solve: In Eclipse Right click on the project in eclipse Properties -> Java Build Path -> Add library -> Server Runtime Library -> Apache Tomcat

Im Maven Project:-

add follwing line in pom.xml file

<dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>${default.javax.servlet.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>${default.javax.servlet.jsp.version}</version>
            <scope>provided</scope>
        </dependency>

Answer 4

I try with http servlet and I find this issue when I write duplicated @WebServlet ,I encountered with this issue.After I remove or change @WebServlet value it is working.

1.Class

@WebServlet("/display")
public class MyFirst extends HttpServlet {

2.Class

@WebServlet("/display")
public class MySecond extends HttpServlet {

Answer 5

You must have packaged the servlet-api.jar along with the other libraries in your war file. You can verify this by opening up your war file and navigating to the WEB-INF/lib folder.

Ideally, you should not provide the servlet-api jar. The container, in your case Tomcat, is responsible for providing it at deploy time to your application. If you try to provide it as well, then issues arise due to version mismatch etc. Best practise is to just avoid packaging it. Remove it from the WEB-INF/lib.

Additional Information

If you are using maven for your packaging, then simply add the provided tag with the dependency and maven will make sure not to package it in the final war file. Something like

<dependency>
    <artifact>..
    <group> ...
    <version> ...
    <scope>provided</scope>
</<dependency>

Answer 6

Some time this problem occur due to incompatible java version and tomcat version.Choose the compatible version of both.