Make code compile with java8 profile

Author: papegaaij

components/serialization/json/spotBugsExcludeFilter.xml

@@ -18,6 +18,7 @@ xsi:schemaLocation="https://github.com/spotbugs/filter/3.0.0 https://raw.githubu
 		<Or>
 			<Class name="com.microsoft.kiota.serialization.mocks.IntersectionTypeMock" />
 			<Class name="com.microsoft.kiota.serialization.mocks.UnionTypeMock" />
+			<Class name="com.microsoft.kiota.serialization.TestParsable" />
 		</Or>
 	</Match>
 	<Match>
@@ -31,4 +32,4 @@ xsi:schemaLocation="https://github.com/spotbugs/filter/3.0.0 https://raw.githubu
 		<Bug pattern="NP_BOOLEAN_RETURN_NULL" />
 		<Class name="com.microsoft.kiota.serialization.JsonParseNode" />
 	</Match>
-</FindBugsFilter>
+</FindBugsFilter>

components/serialization/json/src/main/java/com/microsoft/kiota/serialization/DefaultGsonBuilder.java

@@ -20,7 +20,7 @@
 public class DefaultGsonBuilder {
 
     private static final TypeAdapter<OffsetDateTime> OFFSET_DATE_TIME =
-            new TypeAdapter<>() {
+            new TypeAdapter<OffsetDateTime>() {
                 @Override
                 public OffsetDateTime read(JsonReader in) throws IOException {
                     String stringValue = in.nextString();
@@ -49,7 +49,7 @@ public void write(JsonWriter out, OffsetDateTime value) throws IOException {
             };
 
     private static final TypeAdapter<LocalDate> LOCAL_DATE =
-            new TypeAdapter<>() {
+            new TypeAdapter<LocalDate>() {
                 @Override
                 public LocalDate read(JsonReader in) throws IOException {
                     String stringValue = in.nextString();
@@ -72,7 +72,7 @@ public void write(JsonWriter out, LocalDate value) throws IOException {
             };
 
     private static final TypeAdapter<LocalTime> LOCAL_TIME =
-            new TypeAdapter<>() {
+            new TypeAdapter<LocalTime>() {
                 @Override
                 public LocalTime read(JsonReader in) throws IOException {
                     String stringValue = in.nextString();
@@ -95,7 +95,7 @@ public void write(JsonWriter out, LocalTime value) throws IOException {
             };
 
     private static final TypeAdapter<PeriodAndDuration> PERIOD_AND_DURATION =
-            new TypeAdapter<>() {
+            new TypeAdapter<PeriodAndDuration>() {
                 @Override
                 public PeriodAndDuration read(JsonReader in) throws IOException {
                     String stringValue = in.nextString();
@@ -118,7 +118,7 @@ public void write(JsonWriter out, PeriodAndDuration value) throws IOException {
             };
 
     private static final TypeAdapter<byte[]> BYTE_ARRAY =
-            new TypeAdapter<>() {
+            new TypeAdapter<byte[]>() {
                 @Override
                 public byte[] read(JsonReader in) throws IOException {
                     String stringValue = in.nextString();