diff --git a/src/main/java/de/dentrassi/rpm/builder/PackageEntry.java b/src/main/java/de/dentrassi/rpm/builder/PackageEntry.java
index 6df43fd..f4c2231 100644
--- a/src/main/java/de/dentrassi/rpm/builder/PackageEntry.java
+++ b/src/main/java/de/dentrassi/rpm/builder/PackageEntry.java
@@ -11,6 +11,7 @@
 package de.dentrassi.rpm.builder;
 
 import java.io.File;
+import java.util.Arrays;
 
 public class PackageEntry extends EntryDetails {
     public static class Collector {
@@ -66,7 +67,7 @@ public String[] getExcludes() {
 
         @Override
         public String toString() {
-            return String.format("[collector - from: %s,  directories: %s, symLinks: %s, includes: %s, excludes: %s]", this.from, this.directories, this.symbolicLinks, this.includes, this.excludes);
+            return String.format("[collector - from: %s,  directories: %s, symLinks: %s, includes: %s, excludes: %s]", this.from, this.directories, this.symbolicLinks, Arrays.toString(this.includes), Arrays.toString(this.excludes));
         }
     }
 
diff --git a/src/main/java/de/dentrassi/rpm/builder/RpmMojo.java b/src/main/java/de/dentrassi/rpm/builder/RpmMojo.java
index 2b87c5b..6ec0dff 100644
--- a/src/main/java/de/dentrassi/rpm/builder/RpmMojo.java
+++ b/src/main/java/de/dentrassi/rpm/builder/RpmMojo.java
@@ -813,7 +813,7 @@ public void execute() throws MojoExecutionException, MojoFailureException {
             } catch (final FileAlreadyExistsException e) {
                 // silently ignore
             } catch (final IOException ioe) {
-                this.logger.debug("Unable to create target directory {}", targetDir);
+                this.logger.debug("Unable to create target directory %s", targetDir);
                 throw new MojoExecutionException("RPM build failed.", ioe);
 
             }
@@ -1108,7 +1108,7 @@ protected void fillPayload(final RpmBuilder builder) throws MojoFailureException
         if (this.generateIntermediateDirectories.isEmpty()) {
             ctx = builder.newContext();
         } else {
-            ctx = new MissingDirectoryGeneratorInterceptor(builder.newContext(), this.generateIntermediateDirectories);;
+            ctx = new MissingDirectoryGeneratorInterceptor(builder.newContext(), this.generateIntermediateDirectories);
         }
 
         this.logger.debug("Building payload:");
@@ -1130,12 +1130,12 @@ private void customizeHeader(final RpmBuilder builder) {
 
         builder.setHeaderCustomizer(rpmTagHeader -> {
             if (this.prefixes != null && !this.prefixes.isEmpty()) {
-                this.logger.debug("Building relocatable package: {}", this.prefixes);
+                this.logger.debug("Building relocatable package: %s", this.prefixes);
                 rpmTagHeader.putStringArray(RpmTag.PREFIXES, this.prefixes.toArray(new String[0]));
             }
 
             if (outputTimestampInstant != null) {
-                this.logger.debug("Overriding build time: {}", outputTimestampInstant);
+                this.logger.debug("Overriding build time: %s", outputTimestampInstant);
                 rpmTagHeader.putInt(RpmTag.BUILDTIME, (int) (outputTimestampInstant.toEpochMilli() / 1000));
             }
         });
diff --git a/src/main/java/de/dentrassi/rpm/builder/RulesetEvaluator.java b/src/main/java/de/dentrassi/rpm/builder/RulesetEvaluator.java
index cae97aa..76b5120 100644
--- a/src/main/java/de/dentrassi/rpm/builder/RulesetEvaluator.java
+++ b/src/main/java/de/dentrassi/rpm/builder/RulesetEvaluator.java
@@ -16,7 +16,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.stream.Collectors;
 
 import org.eclipse.packager.rpm.build.FileInformation;
 import org.eclipse.packager.rpm.build.PayloadEntryType;
@@ -41,7 +40,7 @@ public RulesetInstance(final String id, final List<Rule> rules, final String par
 
         private void eval(final Object object, final PayloadEntryType type, final String targetName, final FileInformation info, final Set<String> knownSets) {
             if (knownSets.contains(this.id)) {
-                throw new IllegalStateException(String.format("Recursive calling of rulesets is not allowed- current: %s, previous: %s", this.id, knownSets.stream().collect(Collectors.joining(", "))));
+                throw new IllegalStateException(String.format("Recursive calling of rulesets is not allowed- current: %s, previous: %s", this.id, String.join(", ", knownSets)));
             }
 
             knownSets.add(this.id);