initial version

src/main/java/de/muehlencord/mapstruct/support/WitherAccessorNamingStrategy.java

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+package de.muehlencord.mapstruct.support;
+
+import javax.lang.model.element.ExecutableElement;
+import org.mapstruct.ap.spi.DefaultAccessorNamingStrategy;
+
+/**
+ * MapStruct naming strategy to to support fluent API withXYZ setters. When this strategy is applied, the wither are
+ * ignored so just the normal setter are used.
+ *
+ * @author Joern Muehlencord, 2021-05-01
+ * @since 1.4.2
+ */
+public class WitherAccessorNamingStrategy extends DefaultAccessorNamingStrategy {
+
+  @Override
+  protected boolean isFluentSetter(ExecutableElement method) {
+    return !isWitherMethod(method) && super.isFluentSetter(method);
+  }
+
+  protected boolean isWitherMethod(ExecutableElement method) {
+    String methodName = method.getSimpleName().toString();
+    return methodName.length() > 4 && methodName.startsWith("with") && Character.isUpperCase(methodName.charAt(4));
+  }
+
+
+}

src/main/resources/META-INF/services/org.mapstruct.ap.spi.AccessorNamingStrategy

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+de.muehlencord.mapstruct.support.WitherAccessorNamingStrategy

src/test/java/de/muehlencord/mapstruct/support/Person.java

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+package de.muehlencord.mapstruct.support;
+
+/**
+ * Example class used in README.md
+ *
+ * @author Joern Muehlencord, 2021-05-01
+ * @since 1.4.2
+ */
+public class Person {
+
+  private String firstName;
+  private String lastName;
+
+  // standard getter / setter - these are covered by mapstruct by default */
+  public String getFirstName() {
+    return firstName;
+  }
+
+  public void setFirstName(String firstName) {
+    this.firstName = firstName;
+  }
+
+  public String getLastName() {
+    return lastName;
+  }
+
+  public void setLastName(String lastName) {
+    this.lastName = lastName;
+  }
+
+  /* fluent setter - these are detected as extra setters and would
+     cause an mapping exception, if the mapper is annotated with
+     unmappedTargetPolicy = ReportingPolicy.ERROR.
+   */
+
+  public Person withFirstName(String firstName) {
+    this.firstName = firstName;
+    return this;
+  }
+
+  public Person withLastName(String lastName) {
+    this.lastName = lastName;
+    return this;
+  }
+}