IOUtils.write() throws
OutOfMemoryError/NegativeArraySizeException while writing big strings.
Better test than in PR that validates the output size.
MODIFY
src/test/java/org/apache/commons/io/IOUtilsTest.java
src/test/java/org/apache/commons/io/IOUtilsTest.java
import org.apache.commons.io.input.NullInputStream;
import org.apache.commons.io.input.StringInputStream;
import org.apache.commons.io.output.AppendableWriter;
+import org.apache.commons.io.output.CountingOutputStream;
import org.apache.commons.io.output.NullOutputStream;
import org.apache.commons.io.output.StringBuilderWriter;
import org.apache.commons.io.test.TestUtils;
import org.apache.commons.io.test.ThrowOnCloseReader;
+import org.apache.commons.lang3.StringUtils;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.Test;
@@ -319,6 +321,39 @@ public void testAsWriterStringBuilder() {
assertSame(w, IOUtils.writer(w));
}
+ /**
+ * IO-764 IOUtils.write() throws NegativeArraySizeException while writing big strings.
+ * <pre>
+ * java.lang.OutOfMemoryError: Java heap space
+ * at java.lang.StringCoding.encode(StringCoding.java:350)
+ * at java.lang.String.getBytes(String.java:941)
+ * at org.apache.commons.io.IOUtils.write(IOUtils.java:3367)
+ * at org.apache.commons.io.IOUtilsTest.testBigString(IOUtilsTest.java:1659)
+ * </pre>
+ */
+ @Test
+ public void testBigString() throws IOException {
+ // 3_000_000 is a size that we can allocate for the test string with Java 8 on the command line as:
+ // mvn clean test -Dtest=IOUtilsTest -DtestBigString=3000000
+ // 6_000_000 failed with the above
+ //
+ // TODO Can we mock the test string for this test to pretend to be larger?
+ // Mocking the length seems simple but how about the data?
+ final int repeat = Integer.getInteger("testBigString", 3_000_000);
+ String data;
+ try {
+ data = StringUtils.repeat("\uD83D", repeat);
+ } catch (OutOfMemoryError e) {
+ System.err.printf("Don't fail the test if we cannot build the fixture, just log, fixture size = %,d%n.", repeat);
+ e.printStackTrace();
+ return;
+ }
+ try (CountingOutputStream os = new CountingOutputStream(NullOutputStream.INSTANCE)) {
+ IOUtils.write(data, os, StandardCharsets.UTF_8);
+ assertEquals(repeat, os.getByteCount());
+ }
+ }
+
@Test
public void testClose() {
assertDoesNotThrow(() -> IOUtils.close((Closeable) null));

[IO-764] IOUtils.write() throws
OutOfMemoryError/NegativeArraySizeException while writing big strings.

- Better test than in PR #343 that validates the output size.