From 8bb09275797ca97868e2ed899640f5050243da0e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radek=20Posto=C5=82owicz?= <postolowicz@gmail.com>
Date: Tue, 16 Aug 2022 16:40:07 +0200
Subject: [PATCH 1/2] DO NOT MERGE

---
 parent/pom.xml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/parent/pom.xml b/parent/pom.xml
index 1c031a7b71..ec686bd641 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -363,8 +363,8 @@
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.8.1</version>
                     <configuration>
-                        <source>1.8</source>
-                        <target>1.8</target>
+                        <source>11</source>
+                        <target>11</target>
                     </configuration>
                 </plugin>
                 <plugin>

From 33303712e0023040c82cf4b166cccfea6e36d912 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radek=20Posto=C5=82owicz?= <postolowicz@gmail.com>
Date: Tue, 16 Aug 2022 16:40:20 +0200
Subject: [PATCH 2/2] wip

---
 .../ap/test/bugs/_2937/Issue2937Mapper.java   | 129 ++++++++++++++++++
 .../ap/test/bugs/_2937/Issue2937Test.java     |  26 ++++
 2 files changed, 155 insertions(+)
 create mode 100644 processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Mapper.java
 create mode 100644 processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Test.java

diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Mapper.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Mapper.java
new file mode 100644
index 0000000000..c944156a9e
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Mapper.java
@@ -0,0 +1,129 @@
+package org.mapstruct.ap.test.bugs._2937;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.mapstruct.CollectionMappingStrategy;
+import org.mapstruct.Condition;
+import org.mapstruct.Mapper;
+import org.mapstruct.ReportingPolicy;
+
+@Mapper(unmappedTargetPolicy = ReportingPolicy.IGNORE,
+	collectionMappingStrategy = CollectionMappingStrategy.ADDER_PREFERRED)
+public interface Issue2937Mapper {
+
+	PersonDTO toDTO(final Person entity);
+	Person toEntity(final PersonDTO dto);
+
+	AddressDTO toDTO(final Address entity);
+	Address toEntity(final AddressDTO dto);
+
+	@Condition
+    default boolean isConditionSatified(Collection<?> sourceCollection) {
+        return false;
+	}
+
+	class PersonDTO {
+
+		private Set<AddressDTO> addresses = new HashSet<AddressDTO>();
+
+		public void setAddresses(Set<AddressDTO> addresses) {
+			this.addresses = addresses;
+		}
+
+		public Set<AddressDTO> getAddresses() {
+			return this.addresses;
+		}
+
+		public void addAddress(AddressDTO customerAddressVar) {
+			if (customerAddressVar != null) {
+				this.addresses.add(customerAddressVar);
+				customerAddressVar.setPerson(this);
+			}
+		}
+
+		public void removeAddress(AddressDTO customerAddressVar) {
+			if (customerAddressVar != null) {
+				this.addresses.remove(customerAddressVar);
+			}
+		}
+
+	}
+
+	class Address {
+
+		private String addressLine;
+
+		private Person person;
+
+		public String getAddressLine() {
+			return addressLine;
+		}
+
+		public void setAddressLine(String addressLine) {
+			this.addressLine = addressLine;
+		}
+
+		public void setPerson(Person person) {
+			this.person = person;
+		}
+
+		public Person getPerson() {
+			return this.person;
+		}
+
+	}
+
+	class AddressDTO {
+
+		private String addressLine;
+
+		private PersonDTO person;
+
+		public String getAddressLine() {
+			return addressLine;
+		}
+
+		public void setAddressLine(String addressLine) {
+			this.addressLine = addressLine;
+		}
+
+		public void setPerson(PersonDTO person) {
+			this.person = person;
+		}
+
+		public PersonDTO getPerson() {
+			return this.person;
+		}
+
+	}
+
+	class Person {
+
+		private Set<Address> addresses = new HashSet<Address>();
+
+
+		public void setAddresses(Set<Address> addresses) {
+			this.addresses = addresses;
+		}
+
+		public Set<Address> getAddresses() {
+			return this.addresses;
+		}
+
+		public void addAddress(Address customerAddressVar) {
+			if (customerAddressVar != null) {
+				this.addresses.add(customerAddressVar);
+				customerAddressVar.setPerson(this);
+			}
+		}
+
+		public void removeAddress(Address customerAddressVar) {
+			if (customerAddressVar != null) {
+				this.addresses.remove(customerAddressVar);
+			}
+		}
+
+	}
+}
diff --git a/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Test.java b/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Test.java
new file mode 100644
index 0000000000..7ef4a3880c
--- /dev/null
+++ b/processor/src/test/java/org/mapstruct/ap/test/bugs/_2937/Issue2937Test.java
@@ -0,0 +1,26 @@
+package org.mapstruct.ap.test.bugs._2937;
+
+import org.mapstruct.ap.testutil.IssueKey;
+import org.mapstruct.ap.testutil.ProcessorTest;
+import org.mapstruct.ap.testutil.WithClasses;
+
+@WithClasses({
+	Issue2937Mapper.class
+})
+@IssueKey("2937")
+class Issue2937Test {
+
+	@ProcessorTest
+	void shouldCompile() {
+	}
+}
+
+
+//class Issue2891Test {
+//
+//	@RegisterExtension
+//	final GeneratedSource generatedSource = new GeneratedSource()
+//		.addComparisonToFixtureFor( Issue2891Mapper.class );
+//
+//
+//}
\ No newline at end of file