The GWT Eclipse Plugin stopped working in Eclipse 2021-06

I just updated my Eclipse development environment from 2021-03 to 2021-06. The installed GWT Eclipse Plugin (which hasn't been updated since 2017) no longer shows up in the menu bar, and it logs a bunch of errors. Is anyone (Brandon?) still maintaining it?

http://gwt-plugins.github.io/documentation/gwt-eclipse-plugin/Download.html

  GWT Eclipse Plugin 3.0.0.201710131939 com.gwtplugins.eclipse.suite.v3.feature.feature.group GWT Eclipse Plugin

org.osgi.framework.BundleException: Could not resolve module: com.gwtplugins.gdt.eclipse.core [3649]

  Unresolved requirement: Require-Bundle: com.gwtplugins.gdt.eclipse.platform

    -> Bundle-SymbolicName: com.gwtplugins.gdt.eclipse.platform; bundle-version="3.0.0.201710131939"; singleton:="true"

       com.gwtplugins.gdt.eclipse.platform [3651]

         No resolution report for the bundle.  Bundle was not resolved because of a uses constraint violation.

  org.apache.felix.resolver.reason.ReasonException: Uses constraint violation. Unable to resolve resource com.gwtplugins.gdt.eclipse.platform [osgi.identity; type="osgi.bundle"; version:Version="3.0.0.201710131939"; osgi.identity="com.gwtplugins.gdt.eclipse.platform"; singleton:="true"] because it is exposed to package 'javax.servlet' from resources javax.servlet [osgi.identity; type="osgi.bundle"; version:Version="3.0.0.v201112011016"; osgi.identity="javax.servlet"] and jakarta.servlet-api [osgi.identity; type="osgi.bundle"; version:Version="4.0.0"; osgi.identity="jakarta.servlet-api"] via two dependency chains.

Chain 1:

  com.gwtplugins.gdt.eclipse.platform [osgi.identity; type="osgi.bundle"; version:Version="3.0.0.201710131939"; osgi.identity="com.gwtplugins.gdt.eclipse.platform"; singleton:="true"]

    require: (osgi.wiring.bundle=javax.servlet)

     |

    provide: osgi.wiring.bundle: javax.servlet

  javax.servlet [osgi.identity; type="osgi.bundle"; version:Version="3.0.0.v201112011016"; osgi.identity="javax.servlet"]

Chain 2:

  com.gwtplugins.gdt.eclipse.platform [osgi.identity; type="osgi.bundle"; version:Version="3.0.0.201710131939"; osgi.identity="com.gwtplugins.gdt.eclipse.platform"; singleton:="true"]

    require: (osgi.wiring.bundle=org.eclipse.jetty.servlet)

     |

    provide: osgi.wiring.bundle; bundle-version:Version="10.0.5"; osgi.wiring.bundle="org.eclipse.jetty.servlet"

  org.eclipse.jetty.servlet [osgi.identity; type="osgi.bundle"; version:Version="10.0.5"; osgi.identity="org.eclipse.jetty.servlet"]

    import: (&(osgi.wiring.package=javax.servlet)(&(version>=4.0.0)(!(version>=5.0.0))))

     |

    export: osgi.wiring.package: javax.servlet

  jakarta.servlet-api [osgi.identity; type="osgi.bundle"; version:Version="4.0.0"; osgi.identity="jakarta.servlet-api"]

at org.eclipse.osgi.container.Module.start(Module.java:463)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel$2.run(ModuleContainer.java:1849)

at org.eclipse.osgi.internal.framework.EquinoxContainerAdaptor$1$1.execute(EquinoxContainerAdaptor.java:136)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1842)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.incStartLevel(ModuleContainer.java:1783)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1747)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1669)

at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.dispatchEvent(ModuleContainer.java:1)

at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)

at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:345)

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