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Migrate Filter to OncePerRequestFilter

io.moderne.java.spring.framework.MigrateFilterToOncePerRequestFilter

Migrates classes that implement javax.servlet.Filter (or jakarta.servlet.Filter) to extend org.springframework.web.filter.OncePerRequestFilter. This transformation renames doFilter to doFilterInternal, changes parameter types to HTTP variants, removes manual casting, and removes empty init() and destroy() methods.

Recipe source​

This recipe is only available to users of Moderne.

This recipe is available under the Moderne Proprietary License.

Example​

Before​
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;

public class CustomFilter implements Filter {
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // custom logic
        chain.doFilter(request, response);
    }
}
After​
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.*;
import java.io.IOException;

public class CustomFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // custom logic
        chain.doFilter(request, response);
    }
}

Usage​

This recipe has no required configuration options. Users of Moderne can run it via the Moderne CLI:

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell
mod run . --recipe MigrateFilterToOncePerRequestFilter

If the recipe is not available locally, then you can install it using:

mod config recipes jar install io.moderne.recipe:rewrite-spring:0.23.0

See how this recipe works across multiple open-source repositories​

Run this recipe on OSS repos at scale with the Moderne SaaS.

The community edition of the Moderne platform enables you to easily run recipes across thousands of open-source repositories.

Please contact Moderne for more information about safely running the recipes on your own codebase in a private SaaS.

Data Tables​

Source files that had results​

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column NameDescription
Source path before the runThe source path of the file before the run. null when a source file was created during the run.
Source path after the runA recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changesIn a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changesThe specific recipe that made a change.
Estimated time savingAn estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
CycleThe recipe cycle in which the change was made.