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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Reduce memory consumption when repeatedly calling WritableJson.toByteArray","articleBody":"**Enhancement request**\nHi, we are using `LogstashStructuredLogFormatter` in our projects and it has affected the performance because the garbage collector is running a lot. After analyzing the allocated memory we have detected that the `WritableJson.toByteArray` method is the one to blame.\n\nAs far as I can see, you are using 2 buffers in memory for the same thing:\n\n```java\ndefault byte[] toByteArray(Charset charset) {\n\tAssert.notNull(charset, \"'charset' must not be null\");\n\ttry (ByteArrayOutputStream out = new ByteArrayOutputStream()) {\n\t\ttoWriter(new OutputStreamWriter(out, charset));\n\t\treturn out.toByteArray();\n\t}\n\tcatch (IOException ex) {\n\t\tthrow new UncheckedIOException(ex);\n\t}\n}\n```\nThe 2 buffers are:\n1) `ByteArrayOutputStream` buffer.\n2) `OutputStreamWriter.se.bb` (a `ByteBuffer` inside the `StreamEncoder` inside the `OutputStreamWriter`)\n\nDo you think that you could use \"toJsonString().getBytes()\"? Or maybe use some kind of `org.springframework.core.io.buffer.DataBuffer` implementation?\n\nAlso, when you compare `WritableJson` with Jackson `ObjectMapper`, you see that the `ObjectMapper` includes a \"BufferRecycler\" to reduce the number of times that the garbage collection has to run.\n\nDo you think that you could use something similar?\n\nThanks!","author":{"url":"https://github.com/System25","@type":"Person","name":"System25"},"datePublished":"2026-03-05T12:40:13Z","url":"https://github.com/spring-projects/spring-boot/issues/49428"}