diff --git a/src/main/java/com/googlesource/gerrit/plugins/findowners/Action.java b/src/main/java/com/googlesource/gerrit/plugins/findowners/Action.java
index 2d5e78c..6e38b29 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/findowners/Action.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/findowners/Action.java
@@ -115,7 +115,7 @@
 
   // Used by integration tests, because they do not have ReviewDb Provider.
   public Response<RestResult> apply(ChangeResource rsrc, Parameters params)
-      throws IOException, StorageException, BadRequestException {
+      throws StorageException, BadRequestException {
     ChangeData changeData = changeDataFactory.create(rsrc.getChange());
     return getChangeData(params, changeData);
   }
@@ -155,7 +155,7 @@
 
   /** REST API to return owners info of a change. */
   public Response<RestResult> getChangeData(Parameters params, ChangeData changeData)
-      throws StorageException, BadRequestException, IOException {
+      throws StorageException, BadRequestException {
     int patchset = getValidPatchsetNum(changeData, params.patchset);
     ProjectState projectState = projectCache.get(changeData.project());
     Boolean useCache = params.nocache == null || !params.nocache;
@@ -235,7 +235,7 @@
           .setLabel("Find Owners")
           .setTitle("Find owners to add to Reviewers list")
           .setVisible(needFindOwners);
-    } catch (IOException | StorageException e) {
+    } catch (StorageException e) {
       logger.atSevere().withCause(e).log("Exception for %s", Config.getChangeId(changeData));
       throw new IllegalStateException(e);
     }
diff --git a/src/main/java/com/googlesource/gerrit/plugins/findowners/Cache.java b/src/main/java/com/googlesource/gerrit/plugins/findowners/Cache.java
index 71fa1f9..e3c9242 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/findowners/Cache.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/findowners/Cache.java
@@ -25,7 +25,6 @@
 import com.google.gerrit.server.git.GitRepositoryManager;
 import com.google.gerrit.server.project.ProjectState;
 import com.google.gerrit.server.query.change.ChangeData;
-import java.io.IOException;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Map;
@@ -98,7 +97,7 @@
       GitRepositoryManager repoManager,
       PluginConfigFactory configFactory,
       ChangeData changeData)
-      throws StorageException, IOException {
+      throws StorageException {
     return get(
         useCache,
         projectState,
@@ -120,7 +119,7 @@
       PluginConfigFactory configFactory,
       ChangeData changeData,
       int patchset)
-      throws StorageException, IOException {
+      throws StorageException {
     String branch = changeData.change().getDest().get();
     String dbKey = Cache.makeKey(changeData.getId().get(), patchset, repoManager);
     // TODO: get changed files of the given patchset?
diff --git a/src/main/java/com/googlesource/gerrit/plugins/findowners/Checker.java b/src/main/java/com/googlesource/gerrit/plugins/findowners/Checker.java
index c3422ef..6fae98f 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/findowners/Checker.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/findowners/Checker.java
@@ -26,7 +26,6 @@
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gerrit.server.rules.StoredValues;
 import com.googlecode.prolog_cafe.lang.Prolog;
-import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
@@ -135,14 +134,14 @@
               minVoteLevel);
       return checker.findApproval(
           StoredValues.ACCOUNT_CACHE.get(engine), StoredValues.EMAILS.get(engine));
-    } catch (StorageException | IOException e) {
+    } catch (StorageException e) {
       logger.atSevere().withCause(e).log("Exception for %s ", Config.getChangeId(changeData));
       return 0; // owner approval may or may not be required.
     }
   }
 
   /** Returns 1 if owner approval is found, -1 if missing, 0 if unneeded. */
-  int findApproval(AccountCache accountCache, Emails emails) throws StorageException, IOException {
+  int findApproval(AccountCache accountCache, Emails emails) throws StorageException {
     if (isExemptFromOwnerApproval(changeData)) {
       return 0;
     }