Fix deprecated StringUtils and Charsets usages

src/main/java/com/arakelian/jackson/FilteringJsonGenerator.java

@@ -8,7 +8,6 @@
 import java.util.List;
 import java.util.Set;
 
-import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -142,7 +141,7 @@ private boolean hasArrayBrackets(final CharSequence path, final int index) {
     }
 
     private boolean isRoot(final CharSequence path) {
-        return StringUtils.equals(".", path);
+        return ".".contentEquals(path);
     }
 
     private boolean pathStartsWith(
@@ -201,7 +200,7 @@ protected boolean test() {
             final StackTraceElement[] trace = Thread.currentThread().getStackTrace();
             for (final StackTraceElement e : trace) {
                 final String m = e.getMethodName();
-                if (StringUtils.startsWith(m, "write")) {
+                if (m.startsWith("write")) {
                     LOGGER.trace("{} {}: {}", getCurrentPath(), m, test);
                     break;
                 }

src/test/java/com/arakelian/jackson/FilteringJsonGeneratorTest.java

@@ -7,12 +7,12 @@
 import java.io.StringReader;
 import java.io.StringWriter;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.Collection;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 import java.util.regex.Pattern;
-
-import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
@@ -23,7 +23,6 @@
 import com.fasterxml.jackson.core.JsonFactory;
 import com.fasterxml.jackson.core.JsonGenerator;
 import com.fasterxml.jackson.databind.JsonNode;
-import com.google.common.base.Charsets;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Splitter;
 import com.google.common.collect.ImmutableSet;
@@ -46,7 +45,7 @@ public FilterParser(final String resource) {
         public Collection<Object[]> data() throws IOException {
             final URL url = FilterParser.class.getResource(resource);
             assertTrue(url != null, "Resource does not exist: " + resource);
-            final String content = Resources.toString(url, Charsets.UTF_8);
+            final String content = Resources.toString(url, StandardCharsets.UTF_8);
 
             final List<Object[]> data = Lists.newArrayList();
 
@@ -123,7 +122,7 @@ private boolean skip(final String line) {
 
         private Set<String> split(final String path) {
             final List<String> paths = COMMA_SPLITTER
-                    .splitToList(StringUtils.defaultString(StringUtils.equals(path, "empty") ? null : path));
+                    .splitToList(Objects.toString("empty".equals(path) ? null : path, ""));
             return ImmutableSet.copyOf(paths);
         }
     }

src/test/java/com/arakelian/jackson/utils/JacksonUtilsTest.java

@@ -436,7 +436,7 @@ public void testTraverse() throws IOException {
         values.clear();
         JacksonUtils.traverse(
                 root,
-                name -> !StringUtils.equals(name, "address"),
+                name -> !"address".equals(name),
                 node -> {
                     // collect values as we traverse
                     values.add(node.asText());