diff --git a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/AbstractConfigSource.java b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/AbstractConfigSource.java
index d89e1d8c2..f0037f027 100644
--- a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/AbstractConfigSource.java
+++ b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/AbstractConfigSource.java
@@ -14,11 +14,16 @@
 import com.intellij.openapi.roots.ModuleRootManager;
 import com.intellij.openapi.vfs.VfsUtil;
 import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiFile;
+import io.quarkus.deployment.util.IoUtil;
+import org.apache.commons.io.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.StringReader;
 import java.util.List;
 import java.util.Map;
 
@@ -147,6 +152,11 @@ public String getSourceConfigFileURI() {
 		return null;
 	}
 
+	@Override
+	public boolean isSourceConfigFile(VirtualFile file) {
+		return file.equals(sourceConfigFile);
+	}
+
 	private static String fixURI(String uri) {
 		return VfsUtil.toUri(uri).toString();
 	}
@@ -164,7 +174,7 @@ protected final T getConfig() {
 		}
 		try {
 			long currentLastModified = configFile.getModificationStamp();
-			if (currentLastModified != lastModified) {
+			if (currentLastModified > lastModified) {
 				reset();
 				try (InputStream input = configFile.getInputStream()) {
 					config = loadConfig(input);
@@ -180,6 +190,19 @@ protected final T getConfig() {
 		return config;
 	}
 
+	@Override
+	public void reload(PsiFile file) {
+		reset();
+		String content = file.getText();
+		try (InputStream input = IOUtils.toInputStream(content)) {
+			config = loadConfig(input);
+			lastModified = System.currentTimeMillis();
+		} catch (IOException e) {
+			reset();
+			LOGGER.error("Error while loading properties from '" + sourceConfigFile + "'.", e);
+		}
+	}
+
 	@Override
 	public Integer getPropertyAsInt(String key) {
 		String property = getProperty(key);
diff --git a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/IConfigSource.java b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/IConfigSource.java
index c09c70497..96cd5edd1 100644
--- a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/IConfigSource.java
+++ b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/IConfigSource.java
@@ -10,6 +10,7 @@
 package com.redhat.devtools.intellij.lsp4mp4ij.psi.core.project;
 
 import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiFile;
 
 import java.util.List;
 import java.util.Map;
@@ -60,6 +61,8 @@ public interface IConfigSource {
 	 */
 	String getSourceConfigFileURI();
 
+	boolean isSourceConfigFile(VirtualFile file);
+
 	/**
 	 * Returns a list of all values for properties and different profiles that are
 	 * defined in this config source.
@@ -100,4 +103,5 @@ public interface IConfigSource {
 	 */
 	Set<String> getAllKeys();
 
+	void reload(PsiFile file);
 }
diff --git a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProject.java b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProject.java
index de88dd155..1fd13b0e9 100644
--- a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProject.java
+++ b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProject.java
@@ -9,9 +9,13 @@
 *******************************************************************************/
 package com.redhat.devtools.intellij.lsp4mp4ij.psi.core.project;
 
+import com.intellij.openapi.application.ReadAction;
 import com.intellij.openapi.compiler.CompilerPaths;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.psi.PsiDocumentManager;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.PsiManager;
 import com.redhat.devtools.intellij.lsp4mp4ij.psi.internal.core.project.ConfigSourcePropertiesProvider;
 import org.eclipse.lsp4mp.commons.utils.ConfigSourcePropertiesProviderUtils;
 import org.eclipse.lsp4mp.commons.utils.IConfigSourcePropertiesProvider;
@@ -190,8 +194,19 @@ public List<IConfigSource> getConfigSources() {
 	 * Evict the config sources cache and related cached information as soon as one
 	 * of properties, yaml file is saved.
 	 */
-	public void evictConfigSourcesCache() {
-		configSources = null;
+	public void evictConfigSourcesCache(VirtualFile file) {
+		List<IConfigSource> configSources = getConfigSources();
+		for (IConfigSource configSource: configSources) {
+			if (configSource.isSourceConfigFile(file)) {
+				ReadAction.compute(() -> {
+					PsiFile psiFile = PsiManager.getInstance(javaProject.getProject()).findFile(file);
+					if (psiFile != null) {
+						configSource.reload(psiFile);
+					}
+					return null;
+				});
+			}
+		}
 		propertyValueExpander = null;
 		aggregatedPropertiesProvider = null;
 	}
diff --git a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProjectManager.java b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProjectManager.java
index 117a82920..b4e2f8af7 100644
--- a/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProjectManager.java
+++ b/src/main/java/com/redhat/devtools/intellij/lsp4mp4ij/psi/core/project/PsiMicroProfileProjectManager.java
@@ -63,7 +63,7 @@ public void sourceFilesChanged(Set<Pair<VirtualFile, Module>> sources) {
 					Module javaProject = pair.getSecond();
 					PsiMicroProfileProject mpProject = getJDTMicroProfileProject(javaProject);
 					if (mpProject != null) {
-						mpProject.evictConfigSourcesCache();
+						mpProject.evictConfigSourcesCache(file);
 					}
 				}
 			}
diff --git a/src/main/java/com/redhat/devtools/intellij/quarkus/QuarkusPostStartupActivity.java b/src/main/java/com/redhat/devtools/intellij/quarkus/QuarkusPostStartupActivity.java
index 58997c435..e4719bace 100644
--- a/src/main/java/com/redhat/devtools/intellij/quarkus/QuarkusPostStartupActivity.java
+++ b/src/main/java/com/redhat/devtools/intellij/quarkus/QuarkusPostStartupActivity.java
@@ -14,12 +14,20 @@
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.startup.StartupActivity;
 import com.redhat.devtools.intellij.lsp4mp4ij.classpath.ClasspathResourceChangedManager;
+import com.redhat.devtools.intellij.lsp4mp4ij.psi.core.project.PsiMicroProfileProjectManager;
 import org.jetbrains.annotations.NotNull;
 
 public class QuarkusPostStartupActivity implements StartupActivity, DumbAware {
     @Override
     public void runActivity(@NotNull Project project) {
         ClasspathResourceChangedManager.getInstance(project);
+        // Force the instantiation of the manager to be sure that classpath listener
+        // are registered before QuarkusLanguageClient classpath listener
+        // When an application.properties changed
+        // - the manager need to update the properties cache
+        // - and after the QuarkusLanguageClient throws an event to trigger Java validation.
+        // As java validation requires the properties cache, it needs that cache must be updated before.
+        PsiMicroProfileProjectManager.getInstance(project);
         QuarkusProjectService.getInstance(project);
     }
 }