Fix deriving DataSources from custom type

Eliminate the unsupported datasource property exception thrown when trying to derive a datasource from an unknown datasource type. See gh-27453

Author: saraswathy-krish

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/jdbc/DataSourceBuilder.java

@@ -281,17 +281,22 @@ public String toString() {
 }
 
 Method findSetter(Class<?> type) {
-return extracted("set", type);
+return extracted("set", type, true);
 }
 
 Method findGetter(Class<?> type) {
-return extracted("get", type);
+return extracted("get", type, false);
 }
 
-private Method extracted(String prefix, Class<?> type) {
+private Method extracted(String prefix, Class<?> type, boolean hasParameter) {
 for (String candidate : this.names) {
-Method method = ReflectionUtils.findMethod(type, prefix + StringUtils.capitalize(candidate),
-String.class);
+Method method;
+if (hasParameter) {
+method = ReflectionUtils.findMethod(type, prefix + StringUtils.capitalize(candidate), String.class);
+}
+else {
+method = ReflectionUtils.findMethod(type, prefix + StringUtils.capitalize(candidate));
+}
 if (method != null) {
 return method;
 }

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/jdbc/DataSourceBuilderTests.java

@@ -331,6 +331,19 @@ void buildWhenDerivedFromExistingDatabaseWithTypeChange() {
 assertThat(built.getUrl()).isEqualTo("jdbc:postgresql://localhost:5432/postgres");
 }
 
+@Test // gh -27295
+void buildWhenDerivedFromCustomTypeSpecifiedReturnsDataSource() {
+CustomDataSource dataSource = new CustomDataSource();
+dataSource.setUsername("test");
+dataSource.setPassword("secret");
+dataSource.setUrl("jdbc:postgresql://localhost:5432/postgres");
+DataSourceBuilder<?> builder = DataSourceBuilder.derivedFrom(dataSource).type(SimpleDriverDataSource.class);
+SimpleDriverDataSource testSource = (SimpleDriverDataSource) builder.build();
+assertThat(testSource.getUsername()).isEqualTo("test");
+assertThat(testSource.getUrl()).isEqualTo("jdbc:postgresql://localhost:5432/postgres");
+assertThat(testSource.getPassword()).isEqualTo("secret");
+}
+
 final class HidePackagesClassLoader extends URLClassLoader {
 
 private final String[] hiddenPackages;