fix: remove -Xlint:unchecked, suppress all existing violations

Author: Noam Lewis

oauth2_http/java/com/google/auth/oauth2/ExternalAccountCredentials.java

@@ -396,6 +396,7 @@ public static ExternalAccountCredentials fromStream(
  * @param transportFactory HTTP transport factory, creates the transport used to get access tokens
  * @return the credentials defined by the JSON
  */
+ @SuppressWarnings("unchecked")
  static ExternalAccountCredentials fromJson(
  Map<String, Object> json, HttpTransportFactory transportFactory) {
  checkNotNull(json);

oauth2_http/java/com/google/auth/oauth2/IdentityPoolCredentialSource.java

@@ -65,6 +65,7 @@ public class IdentityPoolCredentialSource extends ExternalAccountCredentials.Cre
  *
  * <p>Optional headers can be present, and should be keyed by `headers`.
  */
+ @SuppressWarnings("unchecked")
  public IdentityPoolCredentialSource(Map<String, Object> credentialSourceMap) {
  super(credentialSourceMap);
 

oauth2_http/java/com/google/auth/oauth2/ImpersonatedCredentials.java

@@ -362,6 +362,7 @@ public byte[] sign(byte[] toSign) {
  * @return the credentials defined by the JSON
  * @throws IOException if the credential cannot be created from the JSON.
  */
+ @SuppressWarnings("unchecked")
  static ImpersonatedCredentials fromJson(
  Map<String, Object> json, HttpTransportFactory transportFactory) throws IOException {
 
@@ -419,7 +420,7 @@ public boolean createScopedRequired() {
  @Override
  public GoogleCredentials createScoped(Collection<String> scopes) {
  return toBuilder()
- .setScopes(new ArrayList(scopes))
+ .setScopes(new ArrayList<>(scopes))
  .setLifetime(this.lifetime)
  .setDelegates(this.delegates)
  .setHttpTransportFactory(this.transportFactory)

oauth2_http/java/com/google/auth/oauth2/OAuth2Utils.java

@@ -170,6 +170,7 @@ static String validateOptionalString(Map<String, Object> map, String key, String
  }
 
  /** Return the specified list of strings from JSON or throw a helpful error message. */
+ @SuppressWarnings("unchecked")
  static List<String> validateOptionalListString(
  Map<String, Object> map, String key, String errorPrefix) throws IOException {
  Object value = map.get(key);

oauth2_http/java/com/google/auth/oauth2/PluggableAuthCredentialSource.java

@@ -80,6 +80,7 @@ public class PluggableAuthCredentialSource extends ExternalAccountCredentials.Cr
  // location.
  @Nullable final String outputFilePath;
 
+ @SuppressWarnings("unchecked")
  public PluggableAuthCredentialSource(Map<String, Object> credentialSourceMap) {
  super(credentialSourceMap);
 

oauth2_http/javatests/com/google/auth/oauth2/AwsCredentialsTest.java

@@ -210,6 +210,7 @@ public void refreshAccessToken_withServiceAccountImpersonationOptions() throws I
  }
 
  @Test
+ @SuppressWarnings("unchecked")
  public void retrieveSubjectToken() throws IOException {
  MockExternalAccountCredentialsTransportFactory transportFactory =
  new MockExternalAccountCredentialsTransportFactory();
@@ -254,6 +255,7 @@ public void retrieveSubjectToken() throws IOException {
  }
 
  @Test
+ @SuppressWarnings("unchecked")
  public void retrieveSubjectTokenWithSessionTokenUrl() throws IOException {
  MockExternalAccountCredentialsTransportFactory transportFactory =
  new MockExternalAccountCredentialsTransportFactory();

oauth2_http/javatests/com/google/auth/oauth2/ExternalAccountCredentialsTest.java

@@ -346,6 +346,7 @@ public void fromJson_pluggableAuthCredentialsWorkforce() {
  }
 
  @Test
+ @SuppressWarnings("unchecked")
  public void fromJson_pluggableAuthCredentials_allExecutableOptionsSet() {
  GenericJson json = buildJsonPluggableAuthCredential();
  Map<String, Object> credentialSourceMap = (Map<String, Object>) json.get("credential_source");
@@ -400,6 +401,7 @@ public void fromJson_pluggableAuthCredentialsWithServiceAccountImpersonationOpti
  }
 
  @Test
+ @SuppressWarnings("unchecked")
  public void fromJson_pluggableAuthCredentials_withUniverseDomain() {
  GenericJson json = buildJsonPluggableAuthCredential();
  json.set("universe_domain", "universeDomain");

oauth2_http/javatests/com/google/auth/oauth2/MockExternalAccountCredentialsTransport.java

@@ -112,6 +112,7 @@ public void addScopeSequence(List<String>... scopes) {
  }
 
  @Override
+ @SuppressWarnings("unchecked")
  public LowLevelHttpRequest buildRequest(final String method, final String url) {
  MockLowLevelHttpRequest request =
  new MockLowLevelHttpRequest(url) {

pom.xml

@@ -232,7 +232,6 @@
  <source>1.8</source>
  <target>1.8</target>
  <encoding>UTF-8</encoding>
- <compilerArgument>-Xlint:unchecked</compilerArgument>
  </configuration>
  </plugin>
  <plugin>