OpenAPI schemaMappings generator bug

api.yaml

openapi: 3.0.3
info: { title: "Demo - OpenAPI 3.0", version: 1.0.0 }
servers: [{ url: "http://localhost:8080" }]
paths:
  /thing:
    get:
      summary: Get a thing
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema: { $ref: '#/components/schemas/ThingWrapper' }
components:
  schemas:
    ThingWrapper:
      type: object
      properties:
        inner: { $ref: '#/components/schemas/Thing' }
    Thing:
      type: object
      properties:
        text: { type: string }

config.yaml

inputSpec: api.yaml
generatorName: java
schemaMappings:
  ThingWrapper: Wrapper<Thing>

output.log

Download 7.7.0 ...
Downloaded 7.7.0
Did set selected version to 7.7.0
Exception in thread "main" java.lang.NullPointerException: generator name must be specified
        at java.base/java.util.Objects.requireNonNull(Objects.java:360)
        at org.apache.commons.lang3.Validate.notEmpty(Validate.java:388)
        at org.openapitools.codegen.config.CodegenConfigurator.toContext(CodegenConfigurator.java:643)
        at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:744)
        at org.openapitools.codegen.cmd.Generate.execute(Generate.java:527)
        at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
PS C:\Users\dseiler\Dev\GitHub\Xiphoseer\openapi-generator-bug-XXXX> openapi-generator-cli generate -c .\config.yaml
[main] INFO  o.o.codegen.DefaultGenerator - Generating with dryRun=false
[main] INFO  o.o.c.ignore.CodegenIgnoreProcessor - No .openapi-generator-ignore file found.
[main] INFO  o.o.codegen.DefaultGenerator - OpenAPI Generator: java (client)
[main] INFO  o.o.codegen.DefaultGenerator - Generator 'java' is considered stable.
[main] INFO  o.o.c.languages.AbstractJavaCodegen - Environment variable JAVA_POST_PROCESS_FILE not defined so the Java code may not be properly formatted. To define it, try 'export JAVA_POST_PROCESS_FILE="/usr/local/bin/clang-format -i"' (Linux/Mac)
[main] INFO  o.o.c.languages.AbstractJavaCodegen - NOTE: To enable file post-processing, 'enablePostProcessFile' must be set to `true` (--enable-post-process-file for CLI).
[main] INFO  o.o.c.languages.AbstractJavaCodegen - Processing operation null
Exception in thread "main" java.lang.RuntimeException: Could not process model 'ThingWrapper'.Please make sure that your schema is correct!
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:530)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:449)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:1302)
        at org.openapitools.codegen.cmd.Generate.execute(Generate.java:535)
        at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.nio.file.InvalidPathException: Illegal char <<> at index 53: .\src\main\java\org\openapitools\client\model\Wrapper<Thing>.java
        at java.base/sun.nio.fs.WindowsPathParser.normalize(WindowsPathParser.java:204)
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:175)
        at java.base/sun.nio.fs.WindowsPathParser.parse(WindowsPathParser.java:77)
        at java.base/sun.nio.fs.WindowsPath.parse(WindowsPath.java:92)
        at java.base/sun.nio.fs.WindowsFileSystem.getPath(WindowsFileSystem.java:231)
        at java.base/java.nio.file.Path.of(Path.java:148)
        at java.base/java.nio.file.Paths.get(Paths.java:69)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:481)
        ... 5 more