javax.servlet.jsp.PageContext cannot be resolved to a type [duplicate]

Question

I am seeing the below errors in my jsp page -

javax.servlet.jsp.PageContext cannot be resolved to a type
javax.servlet.jsp.JspException cannot be resolved to a type

I have seen a post on this and tried few things that were suggested. BalusC provided a great input - JSTL1.2 and Standard.jar must not be used together. I did this and it fixed the issue for sometime - but it is reappearing. I am not sure if I have any more jar collisions. I have defined all the jars as dependencies in Maven. The below are the dependencies that I have specified pom.xml -

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>3.8.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.2.1</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>
    <dependency>
        <groupId>com.jcraft</groupId>
        <artifactId>jsch</artifactId>
        <version>0.1.38</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>commons-logging</groupId>
        <artifactId>commons-logging</artifactId>
        <version>1.1.1</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.15</version>
        <exclusions>
            <exclusion>
                <groupId>javax.jms</groupId>
                <artifactId>jms</artifactId>
            </exclusion>
            <exclusion>
                <groupId>com.sun.jmx</groupId>
                <artifactId>jmxri</artifactId>
            </exclusion>
            <exclusion>
                <groupId>com.sun.jdmk</groupId>
                <artifactId>jmxtools</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>commons-configuration</groupId>
        <artifactId>commons-configuration</artifactId>
        <version>1.6</version>
    </dependency>
    <dependency>
        <groupId>org.apache.tiles</groupId>
        <artifactId>tiles-jsp</artifactId>
        <version>2.2.2</version>
    </dependency>

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.5.6</version>
    </dependency>

</dependencies>

Answer 1

You will need to import in your project the JSP APIs, which are not included in servlet-api

In my project, the solution is:

<dependency>
  <groupId>javax.servlet.jsp</groupId>
  <artifactId>jsp-api</artifactId>
  <version>2.1</version>
  <scope>provided</scope>
</dependency>

Answer 2

The solution that worked for me, is given in this answer. Go to project properties > Targeted runtimes > Select the checkbox for a runtime (Apache Tomcat 7 in my case).
That's all. Just build the project now and everything will be fine.

Answer 3

Assuming this is the pom for a web application...

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
</dependency>

A number of these dependencies should be set as provided as they are provisioned by the container. You should not bundle these with your application. See Maven dependency scopes. Failure to do this may result in undefined behaviour.

Exactly which dependencies are provided depends on the container.