Drop unreachable IOException from CSSEngine String overloads

[vogella]

parseSelectors(String), parsePropertyValue(String), and parseStyleDeclaration(String) wrap the input in a StringReader and delegate to the Reader-based overload. StringReader.read() never throws IOException, but the signature of the Reader overload propagates IOException up from the SAC parser API, so the String forms used to declare a checked exception that could not actually fire. Drop throws IOException from the three String overloads on the internal CSSEngine interface and wrap the inner Reader call in AbstractCSSEngine in try/catch -> IllegalStateException to preserve the impossible case as a defensive guard. Bundle is x-friends so the signature change is internal-only.

[eclipse-platform-bot]

This pull request changes some projects for the first time in this development cycle.
Therefore the following files need a version increment:

bundles/org.eclipse.e4.ui.css.core/META-INF/MANIFEST.MF

An additional commit containing all the necessary changes was pushed to the top of this PR's branch. To obtain these changes (for example if you want to push more changes) either fetch from your fork or apply the git patch.

Git patch

From 9c672afcdc0f95efde476e8f468f4f1ec82ec8d5 Mon Sep 17 00:00:00 2001
From: Eclipse Platform Bot <platform-bot@eclipse.org>
Date: Thu, 7 May 2026 04:00:18 +0000
Subject: [PATCH] Version bump(s) for 4.40 stream


diff --git a/bundles/org.eclipse.e4.ui.css.core/META-INF/MANIFEST.MF b/bundles/org.eclipse.e4.ui.css.core/META-INF/MANIFEST.MF
index 459c82913a..100f3ec52a 100644
--- a/bundles/org.eclipse.e4.ui.css.core/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.e4.ui.css.core/META-INF/MANIFEST.MF
@@ -4,7 +4,7 @@ Bundle-SymbolicName: org.eclipse.e4.ui.css.core;singleton:=true
 Bundle-Name: %pluginName
 Bundle-Vendor: %providerName
 Bundle-Localization: plugin
-Bundle-Version: 0.14.600.qualifier
+Bundle-Version: 0.14.700.qualifier
 Export-Package: org.eclipse.e4.ui.css.core;x-internal:=true,
  org.eclipse.e4.ui.css.core.css2;x-friends:="org.eclipse.e4.ui.css.swt.theme,org.eclipse.e4.ui.css.swt,org.eclipse.e4.ui.css.jface",
  org.eclipse.e4.ui.css.core.dom;x-friends:="org.eclipse.e4.ui.css.swt,org.eclipse.ui.views.properties.tabbed,org.eclipse.ui.forms",
-- 
2.53.0

Further information are available in Common Build Issues - Missing version increments.

[github-actions]

Test Results

   852 files  ±0     852 suites  ±0   53m 1s ⏱️ - 4m 26s
 7 954 tests ±0   7 711 ✅ ±0  243 💤 ±0  0 ❌ ±0 
20 364 runs  ±0  19 709 ✅ ±0  655 💤 ±0  0 ❌ ±0 

Results for commit 3b795b2. ± Comparison against base commit 7e65263.

[iloveeclipse]

This breaks PDE compile.

Description	Resource	Path	Location	Type
Unreachable catch block for IOException. This exception is never thrown from the try statement body	CssSpyPart.java	/org.eclipse.pde.spy.css/src/org/eclipse/pde/spy/css	line 977	Java Problem

[vogella]

I have a look

[vogella]

This breaks PDE compile.

Description	Resource	Path	Location	Type
Unreachable catch block for IOException. This exception is never thrown from the try statement body	CssSpyPart.java	/org.eclipse.pde.spy.css/src/org/eclipse/pde/spy/css	line 977	Java Problem

Thanks. Fixed with eclipse-pde/eclipse.pde#2327

[vogella]

Validated with a local aggregator build containing 8ccf90a and the PDE fix.