diff --git a/pom.xml b/pom.xml
index 85ac225..fce335b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -135,7 +135,7 @@
                         <lib>${java.home}/lib/rt.jar</lib>
                     </libs>
                     <options>
-                        <option>-keep class !proteomics.**,!ProteomicsLibrary.** { *;}</option>
+                        <option>-keep class !proteomics.**,!ProteomicsLibrary.** { *; }</option>
                         <option>-keepclasseswithmembers public class * { public static void main(java.lang.String[]); }</option>
                         <option>-keepattributes *Annotation*,Signature,InnerClasses,EnclosingMethod</option>
                         <option>-keepclasseswithmembernames,includedescriptorclasses class * { native &lt;methods&gt;; } </option>
diff --git a/src/main/java/proteomics/ECL2.java b/src/main/java/proteomics/ECL2.java
index 07b3f3e..6272aff 100644
--- a/src/main/java/proteomics/ECL2.java
+++ b/src/main/java/proteomics/ECL2.java
@@ -1,6 +1,5 @@
 package proteomics;
 
-import ProteomicsLibrary.IsotopeDistribution;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import proteomics.Index.BuildIndex;
@@ -121,7 +120,7 @@ private ECL2(String parameter_path, String spectra_path, String dbName) throws E
         Class.forName("org.sqlite.JDBC").newInstance();
 
         logger.info("Reading spectra...");
-        JMzReader spectra_parser = null;
+        JMzReader spectra_parser;
         File spectra_file = new File(spectra_path);
         if ((!spectra_file.exists() || (spectra_file.isDirectory()))) {
             throw new FileNotFoundException("The spectra file not found.");
diff --git a/src/main/java/proteomics/Spectrum/PreSpectra.java b/src/main/java/proteomics/Spectrum/PreSpectra.java
index e1dc2ca..c14276d 100644
--- a/src/main/java/proteomics/Spectrum/PreSpectra.java
+++ b/src/main/java/proteomics/Spectrum/PreSpectra.java
@@ -8,10 +8,8 @@
 import ProteomicsLibrary.IsotopeDistribution;
 import static ProteomicsLibrary.Utilities.*;
 import uk.ac.ebi.pride.tools.jmzreader.JMzReader;
-import uk.ac.ebi.pride.tools.jmzreader.JMzReaderException;
 import uk.ac.ebi.pride.tools.jmzreader.model.*;
 import uk.ac.ebi.pride.tools.mzxml_parser.MzXMLFile;
-import uk.ac.ebi.pride.tools.mzxml_parser.MzXMLParsingException;
 import uk.ac.ebi.pride.tools.mzxml_parser.mzxml.model.Scan;
 import uk.ac.ebi.pride.tools.mgf_parser.model.Ms2Query;