This is an automated email from the ASF dual-hosted git repository.
rgoers pushed a commit to branch main
in repository https://gitbox.apache.org/repos/asf/logging-log4j2.git
The following commit(s) were added to refs/heads/main by this push:
new 57af66b97e LOG4J2-3658 - Allow Log4j 2 properties in JSON files
57af66b97e is described below
commit 57af66b97ed789d8bc93bb43e22c557899ad4ced
Author: Ralph Goers <rgo...@apache.org>
AuthorDate: Sun Apr 9 17:03:58 2023 -0700
LOG4J2-3658 - Allow Log4j 2 properties in JSON files
---
.../logging/log4j/util/PropertiesUtilTest.java | 11 +++
.../src/test/resources/PropertiesUtilTest.json | 25 +++++
.../logging/log4j/util/JsonPropertySource.java | 104 +++++++++++++++++++++
.../org/apache/logging/log4j}/util/JsonReader.java | 2 +-
.../apache/logging/log4j/util/PropertiesUtil.java | 60 +++++++++++-
.../logging/log4j/core/util/JsonReaderTest.java | 11 ++-
.../log4j/core/config/jason/JsonConfiguration.java | 4 +-
.../JsonTemplateLayoutAdditionalFieldTest.java | 12 +--
.../log4j/layout/template/json/TestHelpers.java | 2 +-
.../json/resolver/CounterResolverTest.java | 6 +-
.../json/resolver/MessageResolverTest.java | 16 ++--
.../json/resolver/CaseConverterResolver.java | 8 +-
.../resolver/EventAdditionalFieldInterceptor.java | 6 +-
.../template/json/resolver/TemplateResolvers.java | 6 +-
.../json/JsonTemplateLayoutBenchmarkReport.java | 6 +-
.../.3.x.x/LOG4J2-3658_Allow_Json_Properties.xml | 25 +++++
16 files changed, 259 insertions(+), 45 deletions(-)
diff --git
a/log4j-api-test/src/test/java/org/apache/logging/log4j/util/PropertiesUtilTest.java
b/log4j-api-test/src/test/java/org/apache/logging/log4j/util/PropertiesUtilTest.java
index 94ac38d882..7cf423ad30 100644
---
a/log4j-api-test/src/test/java/org/apache/logging/log4j/util/PropertiesUtilTest.java
+++
b/log4j-api-test/src/test/java/org/apache/logging/log4j/util/PropertiesUtilTest.java
@@ -111,6 +111,17 @@ public class PropertiesUtilTest {
}
}
+ @Test
+ @ResourceLock(Resources.SYSTEM_PROPERTIES)
+ public void testJsonProperties() {
+ final PropertiesUtil util = new
PropertiesUtil("PropertiesUtilTest.json");
+ assertNull(util.getStringProperty("log4j2"));
+ assertEquals(true,
util.getBooleanProperty("log4j2.My-App.JNDI.enableJMS"));
+ assertEquals("Groovy,JavaScript",
util.getStringProperty("log4j2.My-App.Script.enableLanguages"));
+ assertEquals("com.acme.log4j.CustomMergeStrategy",
util.getStringProperty("log4j2.My-App.Configuration.mergeStrategy"));
+ assertEquals("Info",
util.getStringProperty("log4j2.*.StatusLogger.defaultStatusLevel"));
+ }
+
@Test
@ResourceLock(value = Resources.SYSTEM_PROPERTIES, mode =
ResourceAccessMode.READ)
public void testPublish() {
diff --git a/log4j-api-test/src/test/resources/PropertiesUtilTest.json
b/log4j-api-test/src/test/resources/PropertiesUtilTest.json
new file mode 100644
index 0000000000..40afc6dfe9
--- /dev/null
+++ b/log4j-api-test/src/test/resources/PropertiesUtilTest.json
@@ -0,0 +1,25 @@
+{
+ "log4j2": {
+ "My-App": {
+ "JNDI": {
+ "enableJMS": "true"
+ },
+ "Script": {
+ "enableLanguages": [
+ "Groovy",
+ "JavaScript"
+ ]
+ },
+ "Configuration": {
+ "mergeStrategy": "com.acme.log4j.CustomMergeStrategy",
+ "location": "classpath:log4j2-My-App.xml",
+ "statusLoggerLevel": "debug"
+ }
+ },
+ "*": {
+ "StatusLogger": {
+ "defaultStatusLevel": "Info"
+ }
+ }
+ }
+}
diff --git
a/log4j-api/src/main/java/org/apache/logging/log4j/util/JsonPropertySource.java
b/log4j-api/src/main/java/org/apache/logging/log4j/util/JsonPropertySource.java
new file mode 100644
index 0000000000..17f2b53459
--- /dev/null
+++
b/log4j-api/src/main/java/org/apache/logging/log4j/util/JsonPropertySource.java
@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache license, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the license for the specific language governing permissions and
+ * limitations under the license.
+ */
+package org.apache.logging.log4j.util;
+
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+/**
+ * Allows Properties to be specified as JSON.
+ */
+public class JsonPropertySource implements PropertySource {
+ private static final int DEFAULT_PRIORITY = 200;
+
+ private final int priority;
+
+ private final PropertiesPropertySource propertySource;
+
+ public JsonPropertySource(final String json) {
+ this(json, DEFAULT_PRIORITY);
+ }
+
+ public JsonPropertySource(final String json, final int priority) {
+ final Map<String, Object> root = Cast.cast(JsonReader.read(json));
+ Properties props = new Properties();
+ populateProperties(props, "", root);
+ propertySource = new PropertiesPropertySource(props);
+ this.priority = priority;
+ }
+
+ @Override
+ public int getPriority() {
+ return priority;
+ }
+
+ @Override
+ public void forEach(BiConsumer<String, String> action) {
+ propertySource.forEach(action);
+ }
+
+ @Override
+ public Collection<String> getPropertyNames() {
+ return propertySource.getPropertyNames();
+ }
+
+ @Override
+ public CharSequence getNormalForm(Iterable<? extends CharSequence> tokens)
{
+ return propertySource.getNormalForm(tokens);
+ }
+
+ @Override
+ public String getProperty(String key) {
+ return propertySource.getProperty(key);
+ }
+
+ @Override
+ public boolean containsProperty(String key) {
+ return propertySource.containsProperty(key);
+ }
+
+ private void populateProperties(Properties props, String prefix,
Map<String, Object> root) {
+ if (!root.isEmpty()) {
+ for (Map.Entry<String, Object> entry : root.entrySet()) {
+ if (entry.getValue() instanceof String) {
+ props.setProperty(createKey(prefix, entry.getKey()),
(String) entry.getValue());
+ } else if (entry.getValue() instanceof List) {
+ final StringBuilder sb = new StringBuilder();
+ ((List<Object>) entry.getValue()).forEach((obj) -> {
+ if (sb.length() > 0) {
+ sb.append(",");
+ }
+ sb.append(obj.toString());
+ });
+ props.setProperty(createKey(prefix, entry.getKey()),
sb.toString());
+ } else {
+ populateProperties(props, createKey(prefix,
entry.getKey()), (Map<String, Object>) entry.getValue());
+ }
+ }
+ }
+ }
+
+ private String createKey(String prefix, String suffix) {
+ if (prefix.isEmpty()) {
+ return suffix;
+ }
+ return prefix + "." + suffix;
+ }
+}
diff --git
a/log4j-core/src/main/java/org/apache/logging/log4j/core/util/JsonReader.java
b/log4j-api/src/main/java/org/apache/logging/log4j/util/JsonReader.java
similarity index 99%
rename from
log4j-core/src/main/java/org/apache/logging/log4j/core/util/JsonReader.java
rename to log4j-api/src/main/java/org/apache/logging/log4j/util/JsonReader.java
index 37dc60eaeb..d30ca637e0 100644
---
a/log4j-core/src/main/java/org/apache/logging/log4j/core/util/JsonReader.java
+++ b/log4j-api/src/main/java/org/apache/logging/log4j/util/JsonReader.java
@@ -14,7 +14,7 @@
* See the license for the specific language governing permissions and
* limitations under the license.
*/
-package org.apache.logging.log4j.core.util;
+package org.apache.logging.log4j.util;
import java.math.BigDecimal;
import java.math.BigInteger;
diff --git
a/log4j-api/src/main/java/org/apache/logging/log4j/util/PropertiesUtil.java
b/log4j-api/src/main/java/org/apache/logging/log4j/util/PropertiesUtil.java
index d96b78f470..eb1d18d7e2 100644
--- a/log4j-api/src/main/java/org/apache/logging/log4j/util/PropertiesUtil.java
+++ b/log4j-api/src/main/java/org/apache/logging/log4j/util/PropertiesUtil.java
@@ -16,8 +16,15 @@
*/
package org.apache.logging.log4j.util;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
import java.lang.invoke.MethodHandles;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
+import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
@@ -46,6 +53,7 @@ import java.util.concurrent.ConcurrentSkipListSet;
public class PropertiesUtil implements PropertyEnvironment {
private static final String LOG4J_PROPERTIES_FILE_NAME =
"log4j2.component.properties";
+ private static final String LOG4J_JSON_FILE_NAME = "log4j2.component.json";
private static final String LOG4J_SYSTEM_PROPERTIES_FILE_NAME =
"log4j2.system.properties";
private static final Lazy<PropertiesUtil> COMPONENT_PROPERTIES =
Lazy.lazy(() -> new PropertiesUtil(LOG4J_PROPERTIES_FILE_NAME));
@@ -72,7 +80,13 @@ public class PropertiesUtil implements PropertyEnvironment {
}
private PropertiesUtil(final String propertiesFileName, final boolean
useTccl) {
- this.environment = new Environment(new
PropertyFilePropertySource(propertiesFileName, useTccl));
+ List<PropertySource> sources = new ArrayList<>();
+ if (propertiesFileName.endsWith(".json") ||
propertiesFileName.endsWith(".jsn")) {
+ sources.addAll(getJsonPropertySources(propertiesFileName, true));
+ } else {
+ sources.add(new PropertyFilePropertySource(propertiesFileName,
useTccl));
+ }
+ this.environment = new Environment(sources);
}
/**
@@ -80,7 +94,8 @@ public class PropertiesUtil implements PropertyEnvironment {
* @param source a property source
*/
PropertiesUtil(final PropertySource source) {
- this.environment = new Environment(source);
+ List<PropertySource> sources = Collections.singletonList(source);
+ this.environment = new Environment(sources);
}
/**
@@ -93,7 +108,10 @@ public class PropertiesUtil implements PropertyEnvironment {
}
public static PropertyEnvironment getProperties(final String namespace) {
- return new Environment(new
PropertyFilePropertySource(String.format("log4j2.%s.properties", namespace)));
+ List<PropertySource> sources = new ArrayList<>();
+ sources.add(new
PropertyFilePropertySource(String.format("log4j2.%s.properties", namespace)));
+ sources.addAll(getJsonPropertySources(String.format("log4j2.%s.json",
namespace), true));
+ return new Environment(sources);
}
public static ResourceBundle getCharsetsResourceBundle() {
@@ -172,6 +190,38 @@ public class PropertiesUtil implements PropertyEnvironment
{
environment.reload();
}
+ private static List<PropertySource> getJsonPropertySources(String
fileName, boolean useTccl) {
+ List<PropertySource> sources = new ArrayList<>();
+ if (fileName.startsWith("file://")) {
+ try {
+ URL url = new URL(fileName);
+ sources.add(new JsonPropertySource(new
String(url.openStream().readAllBytes(),
+ StandardCharsets.UTF_8)));
+ } catch (Exception ex) {
+ LowLevelLogUtil.logException("Unable to read " + fileName, ex);
+ }
+ } else {
+ File file = new File(fileName);
+ if (file.exists()) {
+ try {
+ sources.add(new JsonPropertySource(new String(new
FileInputStream(file).readAllBytes(),
+ StandardCharsets.UTF_8)));
+ } catch (IOException ioe) {
+ LowLevelLogUtil.logException("Unable to read " + fileName,
ioe);
+ }
+ } else {
+ for (final URL url : LoaderUtil.findResources(fileName,
useTccl)) {
+ try (final InputStream in = url.openStream()) {
+ sources.add(new JsonPropertySource(new
String(in.readAllBytes(), StandardCharsets.UTF_8)));
+ } catch (final IOException e) {
+ LowLevelLogUtil.logException("Unable to read " + url,
e);
+ }
+ }
+ }
+ }
+ return sources;
+ }
+
/**
* Provides support for looking up global configuration properties via
environment variables, property files,
* and system properties, in three variations:
@@ -194,7 +244,7 @@ public class PropertiesUtil implements PropertyEnvironment {
private final Map<String, String> literal = new ConcurrentHashMap<>();
private final Map<List<CharSequence>, String> tokenized = new
ConcurrentHashMap<>();
- private Environment(final PropertySource propertySource) {
+ private Environment(final List<PropertySource> propertySources) {
final PropertyFilePropertySource sysProps = new
PropertyFilePropertySource(LOG4J_SYSTEM_PROPERTIES_FILE_NAME);
try {
sysProps.forEach((key, value) -> {
@@ -205,7 +255,7 @@ public class PropertiesUtil implements PropertyEnvironment {
} catch (final SecurityException ex) {
// Access to System Properties is restricted so just skip it.
}
- sources.add(propertySource);
+ sources.addAll(propertySources);
final ServiceRegistry registry = ServiceRegistry.getInstance();
// Does not log errors using StatusLogger, which depends on
PropertiesUtil being initialized.
sources.addAll(registry.getServices(PropertySource.class,
MethodHandles.lookup(), null, /*verbose=*/false));
diff --git
a/log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/JsonReaderTest.java
b/log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/JsonReaderTest.java
index 5da282052d..e3bf5a8ced 100644
---
a/log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/JsonReaderTest.java
+++
b/log4j-core-test/src/test/java/org/apache/logging/log4j/core/util/JsonReaderTest.java
@@ -16,11 +16,6 @@
*/
package org.apache.logging.log4j.core.util;
-import org.assertj.core.api.Assertions;
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.ValueSource;
-
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
@@ -28,6 +23,12 @@ import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
+import org.apache.logging.log4j.util.JsonReader;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
class JsonReaderTest {
@Test
diff --git
a/log4j-core/src/main/java/org/apache/logging/log4j/core/config/jason/JsonConfiguration.java
b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/jason/JsonConfiguration.java
index 18f1cf2604..26495adc92 100644
---
a/log4j-core/src/main/java/org/apache/logging/log4j/core/config/jason/JsonConfiguration.java
+++
b/log4j-core/src/main/java/org/apache/logging/log4j/core/config/jason/JsonConfiguration.java
@@ -19,7 +19,6 @@ package org.apache.logging.log4j.core.config.jason;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
-import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Optional;
@@ -32,12 +31,11 @@ import
org.apache.logging.log4j.core.config.ConfigurationSource;
import org.apache.logging.log4j.core.config.LoggerConfig;
import org.apache.logging.log4j.core.config.Reconfigurable;
import org.apache.logging.log4j.core.config.status.StatusConfiguration;
-import org.apache.logging.log4j.core.util.JsonReader;
-import org.apache.logging.log4j.core.util.Patterns;
import org.apache.logging.log4j.plugins.Node;
import org.apache.logging.log4j.plugins.model.PluginType;
import org.apache.logging.log4j.plugins.util.ResolverUtil;
import org.apache.logging.log4j.util.Cast;
+import org.apache.logging.log4j.util.JsonReader;
public class JsonConfiguration extends AbstractConfiguration implements
Reconfigurable {
private static final String[] VERBOSE_CLASSES = new String[] {
ResolverUtil.class.getName() };
diff --git
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutAdditionalFieldTest.java
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutAdditionalFieldTest.java
index e5580f4172..351a9497fb 100644
---
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutAdditionalFieldTest.java
+++
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutAdditionalFieldTest.java
@@ -16,22 +16,22 @@
*/
package org.apache.logging.log4j.layout.template.json;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.LoggerContext;
import org.apache.logging.log4j.core.test.appender.ListAppender;
import org.apache.logging.log4j.core.test.junit.LoggerContextSource;
import org.apache.logging.log4j.core.test.junit.Named;
-import org.apache.logging.log4j.core.util.JsonReader;
+import org.apache.logging.log4j.util.JsonReader;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.parallel.Execution;
import org.junit.jupiter.api.parallel.ExecutionMode;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.Map;
-
@Execution(ExecutionMode.SAME_THREAD)
class JsonTemplateLayoutAdditionalFieldTest {
diff --git
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/TestHelpers.java
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/TestHelpers.java
index 6a8a4a90e9..59316936fb 100644
---
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/TestHelpers.java
+++
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/TestHelpers.java
@@ -32,9 +32,9 @@ import
org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilder;
import
org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory;
import org.apache.logging.log4j.core.config.builder.impl.BuiltConfiguration;
import org.apache.logging.log4j.core.test.appender.ListAppender;
-import org.apache.logging.log4j.core.util.JsonReader;
import org.apache.logging.log4j.layout.template.json.util.JsonWriter;
import org.apache.logging.log4j.layout.template.json.util.MapAccessor;
+import org.apache.logging.log4j.util.JsonReader;
public final class TestHelpers {
diff --git
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/CounterResolverTest.java
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/CounterResolverTest.java
index 3b6b9586ab..af36ed518c 100644
---
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/CounterResolverTest.java
+++
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/CounterResolverTest.java
@@ -16,14 +16,14 @@
*/
package org.apache.logging.log4j.layout.template.json.resolver;
+import java.math.BigInteger;
+
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.impl.Log4jLogEvent;
-import org.apache.logging.log4j.core.util.JsonReader;
import org.apache.logging.log4j.layout.template.json.JsonTemplateLayout;
+import org.apache.logging.log4j.util.JsonReader;
import org.junit.jupiter.api.Test;
-import java.math.BigInteger;
-
import static org.apache.logging.log4j.layout.template.json.TestHelpers.*;
import static org.assertj.core.api.Assertions.assertThat;
diff --git
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/MessageResolverTest.java
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/MessageResolverTest.java
index 999a6862e6..78d684bf76 100644
---
a/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/MessageResolverTest.java
+++
b/log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/MessageResolverTest.java
@@ -16,27 +16,27 @@
*/
package org.apache.logging.log4j.layout.template.json.resolver;
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.impl.Log4jLogEvent;
import org.apache.logging.log4j.core.test.appender.ListAppender;
import org.apache.logging.log4j.core.test.junit.LoggerContextSource;
import org.apache.logging.log4j.core.test.junit.Named;
-import org.apache.logging.log4j.core.util.JsonReader;
import org.apache.logging.log4j.layout.template.json.JsonTemplateLayout;
import org.apache.logging.log4j.message.Message;
import org.apache.logging.log4j.message.ObjectMessage;
import org.apache.logging.log4j.message.SimpleMessage;
import org.apache.logging.log4j.message.StringMapMessage;
+import org.apache.logging.log4j.util.JsonReader;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;
-import java.nio.charset.StandardCharsets;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
import static org.apache.logging.log4j.layout.template.json.TestHelpers.*;
import static org.assertj.core.api.Assertions.assertThat;
diff --git
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/CaseConverterResolver.java
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/CaseConverterResolver.java
index 118dcfeafd..9d82800c68 100644
---
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/CaseConverterResolver.java
+++
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/CaseConverterResolver.java
@@ -16,13 +16,13 @@
*/
package org.apache.logging.log4j.layout.template.json.resolver;
+import java.util.Locale;
+import java.util.function.Function;
+
import org.apache.logging.log4j.core.LogEvent;
-import org.apache.logging.log4j.core.util.JsonReader;
import
org.apache.logging.log4j.layout.template.json.JsonTemplateLayoutDefaults;
import org.apache.logging.log4j.layout.template.json.util.JsonWriter;
-
-import java.util.Locale;
-import java.util.function.Function;
+import org.apache.logging.log4j.util.JsonReader;
/**
* Converts the case of string values.
diff --git
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/EventAdditionalFieldInterceptor.java
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/EventAdditionalFieldInterceptor.java
index a3e3395d3f..0a9003b057 100644
---
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/EventAdditionalFieldInterceptor.java
+++
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/EventAdditionalFieldInterceptor.java
@@ -16,13 +16,13 @@
*/
package org.apache.logging.log4j.layout.template.json.resolver;
-import org.apache.logging.log4j.core.util.JsonReader;
+import java.util.Map;
+
import
org.apache.logging.log4j.layout.template.json.JsonTemplateLayout.EventTemplateAdditionalField;
import org.apache.logging.log4j.plugins.Namespace;
import org.apache.logging.log4j.plugins.Plugin;
import org.apache.logging.log4j.plugins.PluginFactory;
-
-import java.util.Map;
+import org.apache.logging.log4j.util.JsonReader;
/**
* Interceptor to add {@link EventTemplateAdditionalField
diff --git
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/TemplateResolvers.java
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/TemplateResolvers.java
index adc40c09ac..e05484b859 100644
---
a/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/TemplateResolvers.java
+++
b/log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/TemplateResolvers.java
@@ -16,9 +16,6 @@
*/
package org.apache.logging.log4j.layout.template.json.resolver;
-import org.apache.logging.log4j.core.util.JsonReader;
-import org.apache.logging.log4j.layout.template.json.util.JsonWriter;
-
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
@@ -26,6 +23,9 @@ import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
+import org.apache.logging.log4j.layout.template.json.util.JsonWriter;
+import org.apache.logging.log4j.util.JsonReader;
+
/**
* Main class for compiling {@link TemplateResolver}s from a template.
*/
diff --git
a/log4j-perf/src/main/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutBenchmarkReport.java
b/log4j-perf/src/main/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutBenchmarkReport.java
index c971570646..ae6b180922 100644
---
a/log4j-perf/src/main/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutBenchmarkReport.java
+++
b/log4j-perf/src/main/java/org/apache/logging/log4j/layout/template/json/JsonTemplateLayoutBenchmarkReport.java
@@ -16,9 +16,6 @@
*/
package org.apache.logging.log4j.layout.template.json;
-import org.apache.logging.log4j.core.util.JsonReader;
-import org.apache.logging.log4j.util.Strings;
-
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
@@ -40,6 +37,9 @@ import java.util.Map;
import java.util.Objects;
import java.util.stream.Collectors;
+import org.apache.logging.log4j.util.JsonReader;
+import org.apache.logging.log4j.util.Strings;
+
/**
* Utility class to summarize {@link JsonTemplateLayoutBenchmark} results in
Asciidoctor.
* <p>
diff --git a/src/changelog/.3.x.x/LOG4J2-3658_Allow_Json_Properties.xml
b/src/changelog/.3.x.x/LOG4J2-3658_Allow_Json_Properties.xml
new file mode 100644
index 0000000000..40ee721267
--- /dev/null
+++ b/src/changelog/.3.x.x/LOG4J2-3658_Allow_Json_Properties.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements. See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
+ xmlns="http://logging.apache.org/log4j/changelog";
+ xsi:schemaLocation="http://logging.apache.org/log4j/changelog
https://logging.apache.org/log4j/changelog-0.1.1.xsd";
+ type="changed">
+ <issue id="LOG4J2-3658"
link="https://issues.apache.org/jira/browse/LOG4J2-3658"/>
+ <author id="rgoers"/>
+ <description format="asciidoc">Allow Log4j properties to be provided in JSON
files.</description>
+</entry>
